Whoever wants to be free, therefore, let him not want or avoid anything that is up to others. Otherwise he will necessarily be a slave.

Control thy passions lest they take vengence on thee.

It is not he who reviles or strikes you who insults you, but your opinion that these things are insulting.

To know that you do not know and to be willing to admit that you do not know without sheepishly apologizing is real strength and sets the stage for learning and progress in any endeavor.

What really frightens and dismays us is not external events themselves, but the way in which we think about them. It is not things that disturb us, but our interpretation of their significance.

Ask yourself: Does this appearance (of events) concern the things that are within my own control or those that are not? If it concerns anything outside your control, train yourself not to worry about it.

No one who is in a state of fear or sorrow or tension is free, but whosoever is delivered from sorrows or fears or anxieties is at the same time delivered from servitude.