Every moment think steadily as a Roman and a man to do what thou hast in hand with perfect and simple dignity, and feeling of affection, and freedom, and justice; and to give thyself relief from all other thoughts. And thou wilt give thyself relief, if thou doest every act of thy life as if it were the last, laying aside all carelessness and passionate aversion from the commands of reason, and all hypocrisy, and self-love, and discontent with the portion which has been given to thee.

Both happiness and unhappiness depend on perception

Such as are thy habitual thoughts, such also will be the character of thy mind; for the soul is dyed by the thoughts.

Never esteem anything as of advantage to you that will make you break your word or lose your self-respect.

No one can lose either the past or the future - how could anyone be deprived of what he does not possess? ... It is only the present moment of which either stands to be deprived: and if this is all he has, he cannot lose what he does not have.

Take care that you entertain no notions unsuitable to virtue and reasonable nature.

If any man can convince me and bring home to me that I do not think or act aright, gladly will I change; for I search after truth, by which man never yet was harmed. But he is harmed who abideth on still in his deception and ignorance.