[27]
Do not give your friendship to everyone who desires it, but only to those who are worthy of you; not to those whose society you will most enjoy, but to those with whose help you will best govern the state. Subject your associates to the most searching tests, knowing that all who are not in close touch with you will think that you are like those with whom you live. When you put men in charge of affairs which are not under your personal direction, be governed by the knowledge that you yourself will be held responsible for whatever they do.