Universal self which is beyond the universal modification of ‘Prakriti’ is what is called ‘Ishvara’, the Supreme Ruler, God .
The Yoga of action, leading to union with the soul is fiery aspiration, spiritual reading and devotion to Ishvara.patañjali
Bhakti is a series of succession of mental efforts at religious Realization|realization beginning with ordinary worship ending in a supreme intensity of love for Ishvara.
The faculty of trance ( Samadhi ) becomes perfect in him who dedicates all his powers to Ishvara. By this he knows all that he desires to know, just as it is in reality, in another place, in another body or at another time . Then his intellect knows everything as it is.