“For the one who has mastered the self, the self is a friend.”

The mind can be a friend or the whole opposition, and the difference is training. For the person who has worked with themselves, the inner voice steadies; untrained, the same voice trips them at every gate.

This is the Gita's case for practice in a single line. You will spend every hour of your life in your own company, and the quality of that company can be built.