Breath in yoga

At the Iyengar institute of yoga,Prashant sir always leaves an impression on our eager minds..This is what he said in one such class.
” Breath is the spouse of the mind. If this breath is in tune with the mind, then the asana’s performed have great potency and leads us towards the path of yog and not just yoga. To breathe deeply during asana’s is what a yogi must master with great practice. The fewer the asana’s one practices with correct breath, the closer we come to yog.”