If the original text is missing, it will not be harmful to use it. If you have a big profit, you can use it endlessly. If you are straightforward, if you are all thumbs, if you argue endlessly. Enthusiasm triumphs over cold, and silence triumphs over heat. Quiet thinks the world is right.

The source is Lao Tzu's Tao Te Ching.

The most perfect thing looks incomplete, but its function will never fail; The richest thing is like emptiness, but its function is endless. The most upright thing is like bending; The most dexterous thing seems to be the most clumsy; The most outstanding eloquence is like lisping. Static energy overcomes disturbance, while cold energy overcomes heat. Serenity can rule the world.