I have so many! "Out, damn spot; out I say!" From "Macbeth".
This above all:
To thine own
self be true ... Hamlet
"Why, then the world's mine oyster, which I with sword will open"
Thus the origin of the common phrase "The world is my oyster" which we all today assume means being in charge or simply being given what we desire. But instead of receiving things will relative ease, it was, in fact, meant that we take what we want by force.
I'm sorry, I don't know the precise source, but it goes:
'Ah, what deep thinkers men are...!'
(It could be 'Measure for Measure', or then again, it could have been from one of the unpublished plays. I may know more after I've watched a few more episodes of 'Upstart Crow').
"When you come to a fork in the road...take it." Wait...never mind. That was Yogi Berra.
Almost as good as Shakespeare and almost as old.
LOL