Page "Samkhya" Paragraph 19

The intellect is the first evolute of prakriti and is called mahat or the great one.

It causes the evolution of ego-sense or self-consciousness.

Evolution from self-consciousness is affected by the dominance of gunas.

So dominance of sattva causes the evolution of the five organs of perception, five organs of action and the mind.

Dominance of tamas triggers the evolution of five subtle elements – sound, touch, sight, taste, smell from self consciousness.

These five subtle elements are themselves evolvents and cause the creation of the five gross elements space, air, fire, water and earth.

Rajas is cause of action in the evolutes.

Purusha is pure consciousness absoulte, eternal and subject to no change.

It is neither a product of evolution, nor the cause of any evolute.