The second yoga sutra speaks about the copious flow of nature`s energy and metamorphoses a sadhaka towards the process of evolution. Just like other elements, afflictions and wavering can also be subdued by crushing avidya. Nature`s free flow in specific areas enables the consciousness to be altered and reside in a state of dynamism. This induced energy slowly metamorphoses a yogi into an immortal.

jatyantara in another class, change of birth, another state of life
parinamah change, transformation
prakrti nature, creative cause, nature`s energy
apurat becoming full, being full, abundant flow

The abundant flow of nature`s energy brings about a transformation in one`s birth, aiding the process of evolution.

Just as water can be transformed into vapour or ice, and gold into ornaments, likewise, sufferings and fluctuations can be brought under control and transformed by crushing avidya.

In iv. i, Patanjali explained that nature`s energy flows in such abundance that their consciousness is transformed, enabling them to live in a pure vibrant state in this present life. (If a sadhaka fails to reach perfection during this life, nature may abundantly permeate and perfect his sadhana in the next, so that he may then experience freedom).

Due to the power of his practices, nature`s energy flows such force as to transform him into an immortal. This accords with the theory of evolution. It is fascinating to note also that nature itself is the powerhouse for spiritual evolution.

Buddha, Adi Shankara, Sri Ramanujacarya, Jnanesvar, Tukaram and Nandanar reached kaivalya during their lives here on earth without yogic sadhana, because of the fruits of yogic practices in their previous lives (jatyantara parinama).

Equally, acaryanis Maitreyi, Gargi, Arundhati, Lilavati, Sulabha, Sarada Devi, yogini Lalla of Kashmir and yoginl Motibai of Jaipur, everybody achieved liberation through jatyantara parinama.