I thought to myself, “I am wiser than this man; for neither of us really knows anything fine and good, but this man thinks he knows something when he does not, whereas I, as I do not know anything, do not think I do either. I seem, then, in just this little thing to be wiser than this man at any rate, that what I do not know I do not think I know either.” – Plato

The fool who knows his folly becomes wise by that fact, but the fool who thinks he’s wise — he’s called ‘a fool’ indeed! – Buddha

The fool doth think he is wise, but the wise man knows himself to be a fool – Shakespeare

Let no man deceive himself. If any man among you seems to be wise in this world, let him become a fool, that he may be wise – Paul (the Apostle)

We don’t know a millionth of one percent about anything – Edison

The more I know, the more I realize I don’t know – Einstein

The more certain we are about something, the less incentive we have to learn more. Awareness of one’s ignorance is the first step towards wisdom.