Marcus Aurelius

Accustom yourself not to be disregarding of what someone else has to say: as far as possible enter into the mind of the speaker.
-Marcus Aurelius

Treat with utmost respect your power of forming opinions, for this power alone guards you against making assumptions that are contrary to nature and judgments that overthrow the rule of reason.
-Marcus Aurelius

Failing to understand the workings of one’s own mind is bound to lead to unhappiness.
-Marcus Aurelius

Whosoever does wrong, wrongs himself; whosoever does injustice, does it to himself, making himself evil.
-Marcus Aurelius