Misfortune is what blessings rely on, and misfortune lies behind

When black is rarely seen, it is called black, and when black is often seen, it is called white. This means that this person does not know the difference between black and white (the two contradictory parties transform into each other)

Existence and non-existence are mutually reinforcing, difficult and easy to grow, short and mutually incompatible, high and low, sound and sound harmonious, following each other

No one in the world is soft and weak as water, and no one who attacks the strong can win. It cannot be easily changed. The weak conquers the strong, the soft conquers the strong, no one in the world knows it, and no one can do it. Therefore, the sage said: "To accept the country's filth is to be called the master of the country; to accept the country's bad luck is to be the king of the world." It is true to say the opposite.

Good medicine is bitter in the mouth and good for the disease; honest advice is hard on the ears and good for action