Dhammapada 8.103

If one man conquer in battle a thousand times thousand men, and if another conquer himself, he is the greatest of conquerors.

104, 105. One’s own self conquered is better than all other people; not even a god, a Gandharva, not Mara with Brahman could change into defeat the victory of a man who has vanquished himself, and always lives under restraint.