Purge your mind of all aimless and idle thoughts, especially those that pry into the affairs of others or wish them ill.

If you are distressed by anything external, the pain is not due to the thing itself, but to your estimate of it; and this you have the power to revoke at any moment.

You need to be prepared for firm decisions and action, without losing gentleness towards those who obstruct or abuse you. It's as great a weakness to be angry with them as it is to abandon your plan of action and give up through fear.

To live each day as though one's last, never flustered, never apathetic, never attitudinizing - here is the perfection of character.

Why should we feel anger at the world? As if the world would notice?

Though you break your heart, men will go on as before.

Think of what you have rather than of what you lack. Of the things you have, select the best and then reflect how eagerly you would have sought them if you did not have them.