Authors:

He who is able to conquer others is powerful; he who is able to conquer himself is more powerful.

Laozi, Henri Borel, Kang-hu Kiang (1939). “Laotzu's Tao and wu-wei: A new translation by Bhikshu Wai-tao and Dwight Goddard. Interpretive essays by Henri Borel. Outline of Taoist philosophy and religion by Dr. Kiang Kang-hu”
He who is able to conquer others is powerful; he who is able to conquer himself is more powerful.