And yet self-knowledge is thought by some not so easy. Who knows, my dear sir, but for a time you may have taken yourself for somebody else? Stranger things have happened. "

Be a Columbus to whole new continents and worlds within you, opening new channels, not of trade, but of thought.

He that knows himself, knows others; and he that is ignorant of himself, could not write a very profound lecture on other men's heads.

It is madness for sheep to talk peace with a wolf.

It's not only the most difficult thing to know one's self, but the most inconvenient.

Not until we are lost do we begin to understand ourselves.

Other men's sins are before our eyes; our own are behind our backs.

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

Trust not yourself, but your defects to know, Make use of every friend and every foe.

We know what we are, but know not what we may be.