Few things are needed to make a wise man happy; nothing can make a fool content; that is why most men are miserable.

The only thing constant in life is change

Perseverance is neither praiseworthy nor blameworthy; for it seems to be only the enduring of certain inclinations and opinions which men neither give themselves nor take away from themselves.

True bravery means doing alone that which one could do if all the world were by.

Jealousy is not so much the love of another as the love of ourselves.

Narrowness of mind is often the cause of obstinacy; we do not easily believe beyond what we see.

The love of new acquaintance comes not so much from being weary of what we had before, or from any satisfaction there is in change, as from the distaste we feel in being too little admired by those that know us too well, and the hope of being more admired by those that know us less.