Without mind control and sense control, self realization is simply a show. No path of real self realization can give success if one still holds on to sensual pleasure.

Therefore in the initial stages, the beginners are also expected to be well versed in the philosophy to strengthen the intelligence in order to fix the mind on the process with the power of intelligence. The philosophy of Sankhya helps us to understand our real position with respect to the material manifestation and The Lord.

Different sages have different numbers as we see in the 11th canto of Bhagavatham, but the essence is the same in the Sankhya. Some say 24, others 25, while some other sages say 27 which includes 3 modes of material nature.

Yoga is simply a show when it's intention is Bhoga