The Sankhya accepts TWO eternal and uncreated substances, Soul and Nature.

The Nyaya assumes THREE eternal and uncreated substances,--Atoms, Souls, and God.
The solution of the second problem is the same in all three systems.

It is by knowledge that the soul is emancipated from body or matter or nature.
Worship is inadequate, though not to be despised.

Action is injurious rather than beneficial, for it implies desire.

Only knowledge can lead to entire rest and peace.
According to all three systems, the transmigration of the soul through different bodies is an evil resulting from desire.