My favorites come from Orwells 1984:
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
"WAR IS PEACE
FREEDOM IS SLAVERY
IGNORANCE IS STRENGTH"
Sanity is not statistical
And a few others from my other favorite book, A Clockwork Orange:
"Does God want goodness or the choice of goodness? Is a man who chooses to be bad perhaps in some way better than a man who has the good imposed upon him?"
"If a man cannot choose, he ceases to be a man."