“Let us examine the Yoga Sūtra……
In the 3rd chapter there is the idea of Saṃyama (C3 v4) or the Sādhana of regularly involving the attention of the person towards a specific object or idea.
There are certain Sūtra which tell us of certain powers or clarity developed through Saṃyama.
When a person has reached a certain level of attention he can pursue one examination within his individual capability for a certain period of time.”
– TKV Desikachar France 1983