Some of my favorite quotes from Shakespeare's tragedy Hamlet:
"Frailty, thy name is woman."
"God has given you one face, yet you have given yourselves another."
"Conscience makes cowards of us all."
"There is nothing good nor bad, but thinking makes it so."
"Do you think I am easier to be played on than a pipe?!"
"Revenge should have no bounds."
"Give every man thy ear, but few thy voice."
"Neither a borrower nor a lender be."
"This above all: To thine own self be true. And it must follow, as the night the day, thou canst not then be false to any man."