"If a man . . . would shake and not be shaken, grip and not be gripped, taking care always to squeeze the hand of his adversary as hard as it squeezed him, then he suffered no inconvenience from it."

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Al forms of consensus about ''great'' books and ''perennial'' problems, once stabilized, tend to deteriorate eventually into something philistine. The real life of the mind is always at the frontiers of ''what is already known.'' Those great books don't only need custodians and transmitters. To stay alive, they also need adversaries. The most interesting ideas are heresies.

— Susan Sontag