I.2 yoga cittavrtti nirodhah
Yoga is the cessation of the fluctuations of the mind.
II.44 svādhyāyāt istadevatā samprayogah
Self-study leads towards the realization of God or communion with one’s desired deity.
III.1 desa bandhah cittasya dhāranā
Fixing the consciousness on one point or region is concentration (dharana)
III.2 tatra pratyaya ekatānatā dhyānam
A steady, continuous flow of attention towards the same point or region is meditation (dhyāna)