Chapter two of the Yoga Sutras of Patanjali is the Sadhana Pada takes us ahead by explaining how one might get into a yogic condition. This section contains 55 sutras explaining yoga as a discipline outlining its eight limbs of yoga or practical aspects.Since Samadhi is so challenging, we must approach it carefully. Kriya-yoga is the preparatory stage. Kriya yoga means working towards yoga. One must practice austerity or tapas. One must be disciplined. The organs, mind, intellect, and body must be properly controlled by the self. To do this one must study books that teach about liberating the soul. A yogi must only read to boost his judgments.
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