Patañjali's Yogasūtra I.46

Yogasūtra of Patañjali | Viniyoga with Dr Kausthub Desikachar

Dr. Kausthub Desikachar is the current lineage holder of the Viniyoga® tradition worldwide. He succeeds his father TKV Desikachar, and his grandfather T Krishnamacharya. His objectives include the sharing of the authentic teachings of Yoga to the modern era, as well as building bridges between different healing modalities to promote physical, emotional social and spiritual health.

Yogasūtra I.46 - tā eva sabījaḥ samādhiḥ

All these [processes that involve an object of inquiry] are called Sabīja-samādhi.

These four levels are called Sabīja-samādhi, because they need a focus. They also involve preparation, gradual progression and sustained focus, otherwise, there will be distraction. Without preparation, there can be no foundation, and without gradual progression, sustained focus is almost impossible.