Never contract friendship with a man that is not better than thyself.
Confucius

Observe all men, thyself most.
Benjamin Franklin

Observe constantly that all things take place by change, and accustom thyself to consider that the nature of the Universe loves nothing so much as to change the things which are, and to make new things like them.
Marcus Aurelius

Only trust thyself, and another shall not betray thee.
William Penn

Persuade thyself that imperfection and inconvenience are the natural lot of mortals, and there will be no room for discontent, neither for despair.
Ieyasu Tokugawa

Resolve to be thyself: and know that he who finds himself, loses his misery.
Matthew Arnold

Revere thyself, and yet thyself despise.
Edward Young

The greatest gift is a portion of thyself.
Ralph Waldo Emerson

Thou hast created us for Thyself, and our heart is not quiet until it rests in Thee.
Saint Augustine

When about to commit a base deed, respect thyself, though there is no witness.
Ausonius

Who had deceived thee so often as thyself?
Benjamin Franklin