Sage Patanjali in his book “Yoga Sutra” explained the complete procedure for the integration of body mind and soul in 4 chapters as follows:
Samadhi Pada (51 sutras) :
Samadhi refers to a blissful state where the yogi is absorbed into the One. Here, the sage Patanjali explained the nature and the means to attaining Samadhi. This chapter contains the most famous definitional verse: “Yogaś citta-vritti-nirodha” (“Yoga is living above the mental fluctuation level”).
Sadhana Pada (55 sutras)
Here, the enlightened Guru Patanjali describes “Ashtanga Yoga” the eight limbs that together constitute the complete Yoga system.
Vibhuti Pada (56 sutras)
In Sanskrit the word “Vibhuti means “power” i.e. the Super-natural powers. In this chapter Sri Patanjali explained that the attraction of these super natural powers should be avoided and the attention should be fixed only on realizing the ultimate truth.
Kaivalya Pada (34 sutras)
The Kaivalya Pada describes the nature of ultimate freedom and the reality of the transcendental Cosmic Self.