To know that one knows what one knows, and to know that one doesn't know what one doesn't know, there lies true wisdom.

There are three things to beware of through life: when a man is young, let him beware of his appetites; when he is middle-aged, of his passions; and when old, of covetousness, especially.

There is nothing impossible in all the world except that the heart of man is wanting in resolution.

Better a diamond with a flaw than a pebble without.

Study without reflection is a waste of time; reflection without study is dangerous.

To acknowledge our faults when we are blamed, is modesty; to discover them to one's friends in ingenuousness, is confidence; but to preach them to all the world, if one does not take care, is pride.

Love is like a spice. It can sweeten your life - however, it can spoil it, too.