There are so many great lines, but I like Michael's: "Never hate your enemies, it affects your judgement". I've been able to use that advice.

"Any American who is prepared to run for president should automatically, by definition, be disqualified from ever doing so"-Gore Vidal
"Conformity is the jailer of freedom and enemy of growth"-John Fitzgerald Kennedy
"The reason the mainstream is thought of as a stream is because of its shallowness"-George Carlin