“Another important point is that these Sādhana have steps.
One can go from one Siddhi to another Siddhi.
Each step of Sādhana is also a Siddhi.
On that premise Yoga Citta Vṛtti Nirodha is at every step a Sādhana and a Siddhi.”
– TKV Desikachar France August 1983