Yoga Sūtras

Although it is unchanging, consciousness becomes aware of its own intelligence by means of pervading the forms assumed by the intelligence.

If the mind were perceived by another mind, then there would be an infinite regress of one intelligence being known by another intelligence. This would cause confusion of memory.

The seer is merely the power of seeing. It appears to take on the changing contents of the mind. In reality, it is unchangeable.

Then the seer can abide in its own true nature.

Fluctuations of the mind are stilled by means of practice and non-attachment

Yoga in action consists of self-discipline, study, and surrender

Negative thoughts are violence, etc. They may be created directly, indirectly, or approved; they may be triggered by greed, hatred, or delusion; and they may be slight, moderate, or extreme in intensity. One must become an opponent to such influences by cultivating the opposite.