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tasya bhūmiṣu viniyogaḥ
Its application is in stages
tasya - its
bhūmi - stage; ground; floor of a house; foundation; a place, situation
viniyoga - employment, use, application
Commentary by TKV Desikachar:
“This is what Patañjali says in that everything must be given step by step. Yoga Sūtra Chapter Three verse 6 reflects this idea.” – TKV Desikachar France August 1983
“We should never forget what Patañjali has said – Teach according to the strength, resources and weakness of the individual”. – TKV Desikachar