Good and forgiving men born of high families and endued with fiery energy, do not betray any outward symptoms of what is within them. That king whose counsels cannot be known by either outsiders or those about him, but who knoweth the counsels of others through his spies, enjoyeth his prosperity long. One should never speak of what one intends to do. Let anything thou doest in respect of virtue, profit, and desire, be not known till it is done. Let counsels be not divulged.

In plain words: Good people of strong character do not show outwardly what they feel inside. A king who keeps his plans secret, but learns others' plans through spies, stays prosperous for a long time. Do not announce what you plan to do. Let your actions be known only after they are done.