yoga chitta vritti nirodha

The entire outside world is based on your thoughts and mental attitude. The entire world is your own projection…That is why Yoga does not bother much about changing the outside world…As is the mind, so the man; bondage or liberation are in your own mind. If you feel bound, you are bound. If you feel liberated, you are liberated. Things outside neither bind nor liberate you; only your attitude towards them does that.
— 

Swami Satchidananda on the second yoga sutra.

Yoga chitta vritti nirodha (Yoga is the resolution of the agitations of the mind.)