" If the Party could thrust its hand into the past and say of this or that event, it never happened—that, surely, was more terrifying than mere torture and death?...But where did that knowledge exist? Only in his consciousness, which in any case must soon be annihilated...'Who controls the past,' ran the Party slogan,'controls the future:who controls the present controls the past.'...All that was needed was a series of victories over your own memory. "

― George Orwell , 1984