What do you think is Shakespeare's most amazing quote(s)?

Question

Not like the cheesy cliche' quotes that you study in high school, but the ones you find are most full of wisdom or are the most useful to remember throughout your life? Writing at its best...

Answer 1

A fool thinks himself to be wise, but a wise man knows himself to be a fool.

Cowards die many times before their deaths; the valiant never taste of death but once.

(this isn't the whole quote, it ends something like this: It is strange that men should fear death, being a necessary end, it will come when it will come)

It is neither good nor bad, but thinking makes it so.

Answer 2

Tomorrow and tomorrow and tomorrow creep in this petty pace 'til the last syllable of recorded time; and all our yesterdays have lighted fools the way to dusty death.  Out, out, brief candle; life's but a wand'ring shadow; a poor player that struts and frets his hour upon the stage and then is heard no more.  It is a tale told by an idiot; full of sound and fury; signifying nothing.

Not very cheerful, but profound.

Answer 3

Oh, this woodcock, what an *** it is (From "The Taming of the Shrew")

Answer 4

"The handkerchief!"

I love that quote from Othello.