Yoga Sūtra Chapter Three verse 6

tasya bhūmiṣu viniyogaḥ ||6||

Its application is in stages.

tasya - itsbhūmi - stageviniyoga - employment, use, application

Commentaries and Reflections

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