615  True knowledge exists in knowing that you know nothing.

930  The man who backbites an absent friend, nay, who does not stand up for him when another blames him, the man who angles for bursts of laughter and for the repute of a wit, who can invent what he never saw, who cannot keep a secret - that man is black at heart: mark and avoid him.

1194  The only real security in life comes from knowing that every single day you are improving yourself in some way.

283  The only true wisdom is in knowing you know nothing.

824  The vanity of being known to be trusted with a secret is generally one of the chief motives to disclose it.