The Yoga by which our ancestors have been wise, healthy, prosperous and conquerors of the world since the beginning of creation, this best knowledge of life is like the Philosopher's Stone for us even today as it was in the beginning of creation.

1.  Pranic energy
The body and the universe are a powerful conglomeration of tangible and intangible energies. Physics also believes that matter and energy are the two basic components. In each cell of the body and in each molecule and atom of the universe, 1 lakh to 5 lakh chemical activities take place every moment. When Pranayam is done, these activities increase 10 to 100 times in proportion to the time and the body transforms into a divine energy body. This is what is said in Shrimad Bhagwat Geeta-

Divi Surya Sahasrasya Bhavedyugaduthita.
If Bha: Sadrishi Sa Syadbhasastasya Mahatmanah.
                                                                                            (Bhagavadgita- 11.12)

Therefore, Pranayam awakens and transforms the energy inherent in the body in a positive direction, makes a person healthy and increases his ability infinitely. That is why it is said in the scriptures -
Na Yogat Param Balam- (Gherand Samhita)
On this principle, our revered Gurudev experimented on himself and millions of people of the society. He has freed us from common diseases as well as deadly diseases like Vata-Pitta Kapha Tridosha and cancer, for which Patanjali Institute has scientific proof.
The secret of rejuvenation is- 'Prana'. Wrong diet leads to loss of body power and wrong thoughts lead to loss of mind power. Body and mind become poisonous through anger, worry etc. It is possible to detox them and make your entire existence healthy, happy, peaceful and full of auto-suggestions only through Pranayam.
Basically, the description of Prana Vidya in Vedas is as follows-

Aa Vaat Vaahi Bheshajan Vi Vaat Vaahi Yadrapah.
This is the world disguised as the angel of the gods. 
                                                                             (Rigveda-10.137.3)

Prana is a medicine, meaning oxygen is a medicine. It is not only a medicine, it is a complete medicine. This 'prana' is the carrier of all the divinities of the universe. Prana is a holistic treatment, the basis of prana is complete health. Along with physical changes, the emotional changes that come in the body through prana have very authentic and scientific evidence in our scriptural tradition.
There is a story in Brahmin texts and Puranas that Ashwini Kumars made the decrepit Chyavan Rishi young again. These Ashwini Kumars are none other than Prana-Apan. The advice given by Yamacharya to Nachiketa in Kathopanishad is Prana Vidya. Pranayam is an eternal Divine Therapy.

“Prana evamrita asu: shariram matryam.” 
                                                                     (S.10.1.4.1)

That is, it is only through Prana that we can make ourselves immortal. It is this Vital Force that works day and night without rest from the mother's womb till death. In Brihadaranyaka Upanishad, in the court of Videha Janaka, Vidgadh Shakalya asked Yagyavalkya about the gods, then he described 3003, 33, 6, 2 and 1 god respectively and said that Prana is the main god.
“Katam ako dev iti”? Prana etc.

Sa Brahma tadityachakshate. (Major- 303, 9.9)

Prana itself sits in the centre of everyone (in the heart or womb) in the form of Prajapati and appears in various forms. In Prashnopanishad, Piplad Rishi sings the glory of Prana and says-

Pranasyedam vashe sarvam tridive yatpratisthitam.
Matev putran rakshasva shrischa prajnyam cha vidhehi nah. (Prasnopanishad 2.13)

That is, everything in the three worlds is under the control of Prana. O Prana, protect us like a mother and like a son, give us the boon of wealth and wisdom. The manifestation of such a great Prana Shakti is possible only through the process of Pranayam. Ashtangyoga is like the backbone of Sanatan Dharma. Ashtangyoga has four external parts and three internal parts and Prana acts as a bridge between these two.
Pranayam destroys both our gross and subtle diseases, sorrows and defects and makes us endowed with gross and subtle divine and sacred powers. Maharishi Vyas writes while commenting on Yoga Darshan 2-28 Sutra-

“Yogaanushthanamshuddherviyogakaranam” Yatha Yatha Cha Kshiyate
Inaccuracy: Tatha Tatha kshayakramaanurodhinee gyaanasyaapi deeptirvivardhate.
                                                                                                                                            (Lecture 2.28)

Lingapuraan

Prasad iti samprokta: swante tvih chatushtaye.
                                                                    (Lingapurana-1.8.55.60)

In Linga Puran, the nature of the siddhi (power) generated by Pranayama called Prasad has been described in more detail. It is as follows-

praanopaanah samaanashch udaano vyaan ev ch ||61||
naag: koormastu krakalo devadatto dhananjay:. 
eteshaan ya: prasaadastu marutamiti sansmrt: ||62||
prayaanan kurute tasmaadvayu: praan iti smrt:.
apaanayatyapaanastu aahaaradeen kramen ch. ||63||
vyaano vyaanaamayatyaaghau vyaadhyaadeenaan prakopak:. 
udvejayati marmaani udaanoyan prakeertit: ||64||
saman nayati gatraani samaan: panch vaayav:. 
udgaare naag aakhyaat: koorm milan tu sa: ||65||
krkal: kshutkaayaiv devadatto vijrmbhane. 
dhananjayo mahaaghosh: sarvag: sa mrtepi hi ||66||
iti yo dashavaayoonaan praanaayaamen sidhyati. 
prasaadosy tureey tu om viprashchatushtaye ||67|| 
sarvadvaareshu dehesmin prakaash upajaayate. (geeta-14.11)

Vital Chart

Mansa Jatani Jivanti (Tait., V.3, Anu.4)

All the living beings in the world are born out of mind and become a part of life and it is our mind which keeps our life dynamic. Where there is dynamism control is also important there at the same time. If we talk at material level it becomes evident that it is necessary to use brake to keep the speed of a vehicle under control. And it is a reality that the driver keeps using break during his journey occasionally and finally he arrive at his destination. About control of mind Lord Krishna has said -

Ashansayam Mahabaho Mano Durnigraham Chalam l
Abhyasen Tu Kaunteya Vairagyena Cha Grihayate ll (Geeta, A.6, Shloka- 35)

Fickle mind can be controlled with difficulty there is no doubt in it but with the practice of best things one can have proper control over his mind as Goswami Tulsidas has said that everything in the world keeps getting deviated from its path like when the air blows all the leaves of trees start shaking and similarly that kind of situation appears the mind of every living being becomes getting deviated as it is like uncontrolled running horse-

Yastvavigyanvan Bhavatyayuktena Mansa Sada l
Tasyendriyanyavashyanti Dushtashva Eva Sarthe ll
(Katho. A. 1.  V 3, M5)

Our mind is is the Charioter and when it sees the greenery of forest which is like the material pleasure it keeps running here and there. 
You can take the example of any generation which makes it clear that those who could not keep their mind under control the definitely have to confront difficulties in life and in the era of Satya Yuga Hiranyakashipu and in the Treta era Ravana and in the dwapar era Duryodhana lost their control of mind therefore despite being strong and wealthy and very powerful they all Got ruined. It has been well said that those who act without proper contemplation they repented later.

Drishtidrishyoparaktam Chitam Sarvpratham l (Yog Darshan, kaivalya. 23)

Our mind can know what is right and what is wrong and occasionally we quite often experience this that our mind is is a treasure of of infinite power but we get deviated from the natural course of mind and start running after unnecessary Desire to fulfill them and it is a fact that most of our desires are not natural but they are basically due to the pressure from our family or society like our desire to earn lots of money but we are never born with money it is is this desire which we inherit from our society. If I tell you that you just think what is that the society has not given to you and you will be surprised about what it could be and those who have tendency in Virtuous things I will say that they will talk of of God and many other people will say a that we are aware of God but it could be the truth but many other people would like to know about there is period of which knowledge can be obtained in many birth while it is God which is is the supreme controller of all the Spirits but all this can be possible if we have control over our mind but we mostly think about our body and not about our mind all the time and we are engaged in fulfilling the needs of our body but we never try to fulfill the needs of our mind like most of our energy is spent what to eat to keep our body healthy and enjoy the taste of food how to get attractive look therefore mostly focus on our body which is external and we never think of our mind and its needs.
Just imagine if you know one day that you are going to die in a few moments then what will be the condition of your mind and what will be the things of which you will think it is necessary?

Bandhayaavishyaasaktam Muktaiya Nirvishnam Manah l
Man Aeva Manushyanam Karanam Bandhmokshyoh ll (Cha. A. 13, Shloka 11)

A man is free and he can be in shackles only due to his mind because body does not have even slightest of strength as it has been surrounded by old age diseases and Ud animes like death and this body is like unbaked pottery and can be broken very easy.

How so much attractive the lamp of our body might be and how beautiful it might have been decorated but its natural beauty e will appear only with the burning of the light of mind.

The light of mind can be seen only when it burns and it can be lit bhaiya capable teacher because it is our teacher who can take us in the right direction because if we don't have the knowledge of our direction especially the right one then even rising sun will appear like the sun getting to be set.  

मनसा जातानि जीवन्ति। (तैत्ति., व. 3, अनु. 4)

मन से ही समस्त प्राणी उत्पन्न होकर जीवित जीवन जीने में प्रविष्ट होते हैं। मन ही हमारे जीवन को गतिशील बनाए रखता है और जहाँ गतिशीलता होती है, वहाँ नियंत्रण होना भी आवश्यक हो जाता है। अगर भौतिक स्तर पर बात करें तो देखने में आता है कि किसी भी तरह के वाहन को नियंत्रण में रखने के लिए उसमें ब्रेक अवश्य होता है। चालक स्थिति परिस्थिति के अनुसार ब्रेक का प्रयोग करते हुए अपने गंतव्य तक पहुँच जाता है। मन के नियंत्रण के विषय में, (श्री श्रीकृष्ण)

असंशयं महाबाहो मनो दुर्निग्रहं चलम्।

अभ्यासेन तु कौन्तेय वैराग्येण च गृह्यते।। (गीता, अ.6, श्लो.35)

 चञ्चल मन कठिनता से वश में होने वाला है, इसमें कोई संदेह नहीं। किंतु श्रेष्ठ व्रतों के अभ्यास से चित्त भूमि को एक समान बारंबार करने से मन का निग्रह निरोध किया जा सकता है। (गोस्वामी तुलसीदास) ‘पीपर पात सरिस मन डोला’ चौपाई में भी यह स्पष्ट किया कि जिस प्रकार हल्की सी हवा चलने से पीपल के पत्ते हिलने-डुलने लगते हैं, उसी प्रकार किसी भी प्रकार की परिस्थितियाँ आती हैं तो सबसे पहले मन पर उसका प्रभाव पड़ता है और मन बेलगाम घोड़ों की भांति (उक्त है)-

यस्त्वविज्ञानवान् भवत्ययुक्तेन मनसा सदा।

तस्येन्द्रियाण्यवश्यानि दुष्टाश्वा इव सारथे।। (कठो., अ.1, व.3, म.5)

बुद्धिरूपी सारथी को लेकर संसार जंगल में भोग रूपी हरी-हरी घास देखकर मनमाना उसी और दौड़ता है।

किसी भी युग का उदाहरण लें तो यह स्पष्ट होता है कि जिसने भी मन की लगाम को खींचकर नहीं रखा, उसको संकटों का सामना करना पड़ा। सतयुग में हिरण्यकश्यप रहा हो, त्रेता में रावण या द्वापर में दुर्योधन- इन सबने आत्म-नियंत्रण खो दिया था। इसलिए ये सब प्रतापी और बलिष्ट होते हुए भी नष्ट हो गए। ‘बिन विचारे जो करे, सो पाछे पछताय’।

द्रष्टृीदृश्योपरक्तं चित्तं सर्वार्थम्। (योगदर्शन, कैवल्य. 23)

हम सभी का मन सही क्या है, गलत क्या है, इन सब विषयों को जानने वाला होता है। और समय-समय पर हमें अनुभव भी होता है कि मन अपरिमित शक्ति का भण्डार है पर हम मन की स्वाभाविकता को छोडक़र व्यर्थ इच्छाओं की पूर्ति करने लगते हैं। इसमें से भी आपकी हमारी बहुत सारी इच्छाएँ स्वाभाविक नहीं, वे इच्छाएँ परिवार या समाज के द्वारा हमारे आपके मन में डाली गई हैं, जैसे- धनादि पाने की इच्छा हम जन्म के साथ नहीं लाये, यह हमको समाज के द्वारा दी गई हैं। अगर मैं आपसे कहूँ कि अभी आप कुछ ऐसी बात सोचिए जो आपको समाज ने न दी हो, तो आप अचम्भे में पड़ जाते हैं कि क्या सोचें? इसमें भी कई धर्मानुरागी कहेंगे कि ‘हम ईश्वर के विषय में सोचेंगे’। परन्तु ‘परमात्मा’ के विषय में भी यह सब बातें कहीं से पढ़ी या सुनी हैं। कई लोग तो यह भी कहते हैं कि हम परमात्मा के विषय में जान चुके हैं, इसमें से कुछ सत्य भी हो सकता है, परन्तु कुछ लोगों का विचार तो यह है कि स्वयं अर्थात् ‘आत्मा’के विषय में जानना चाहें तो ये जन्म क्या कई जन्म कम पड़ जाते हैं। (फिर ‘वह तो परम-आत्मा है’) यह सब सम्भव भी हो, परन्तु मन को तो नियंत्रण में लाना पड़ेगा। लेकिन व्यक्ति की दृष्टि मन पर न होकर सिर्फ शरीर पर होती है और हम शरीर की ही जरूरतें पूरी करते रहते हैं। अब खाओ, अब शरीर को सजाओ, संवारो। सारे समय दृष्टि देह पर लगी रहती है। हम सारे समय शरीर को तृप्ति देना चाहते हैं। मन के विषय में तो हम सोचते भी नहीं।

जरा कल्पना कीजिए कि किसी को पता चले कि वह कुछ ही समय में मरने वाला है तो उसके मन की स्थिति क्या होगी? उसका मन संसार की किन-किन चीजों के बारे में सोचेगा?

बन्धाय विषयाऽऽसक्तं मुक्त्यै निर्विषयं मन:।

मन एव मनुष्याणां कारणं बन्धमोक्षयो:।।(चा.,आ.१३, श्लो.११)

मनुष्य मन से ही मुक्त और मन से ही बन्धन में है क्योंकि इस शरीर में बल का लेशमात्र नहीं और इसे व्याधि, जरा और मृत्युरूपी शत्रुओं ने बुरी तरह से घेर रखा है, यह शरीर मिट्टी के कच्चे घड़े के समान क्षणभङ्गुर है।

शरीर रूपी दिया कितना भी आकर्षित हो

सजाने वाले ने उसमें अच्छी-अच्छी नकाशी

की हो, परन्तु उसकी स्वाभाविक सुन्दरता

मन रूपी ज्योति के जलने पर ही दिखाई पड़ती है

मन रूपी ज्योति के जलने पर ही दिखाई पड़ती है। मन रूपी ज्योति को जलाने का सामर्थ्य केवल गुरु के पास होता है। गुरु ही हमें सही दिशा दिखाते हैं क्योंकि ‘अगर सही दिशा और सही समय का ज्ञान न होतो, हमें उगता हुआ सूर्य भी डूबता हुआ प्रतीत होगा।