Renunciation

If discipline of all the members of our being by purification and concentration may be described as the right arm of the body of Yoga, renunciation is its left arm. By discipline or positive practice we confirm in ourselves the truth of things, truth of being, truth of knowledge, truth of love, truth of works and replace with these the falsehoods that have overgrown and perverted our nature; by renunciation we seize upon the falsehoods, pluck up their roots and cast them out of our way so that they shall no longer hamper by their persistence, their resistance or their recurrence the happy and harmonious growth of our divine living. Renunciation is an indispensable instrument of our perfection.

Ref: The Synthesis of Yoga