It is not hoary hairs that bring wisdom; some have an old head on young shoulders.
At times discretion should be thrown aside, and with the foolish we should play the fool.
It is as easy to draw back a stone thrown with force from the hand, as to recall a word once spoken.
Man must be prepared for every event of life, for there is nothing that is durable.
In many things it is not well to say, "Know thyself"; it is better to say, "Know others."
By associating with wise people you will become wise yourself.