After 9/11, we had to look at the world differently. After 9/11, we had to recognize that when we saw a threat, we must take it seriously before it comes to hurt us. In the old days we'd see a threat, and we could deal with it if we felt like it or not. But 9/11 changed it all.
Men with the muckrake are often indispensable to the well-being of society, but only if they know when to stop raking the muck, and to look upward to the celestial crown above them.... If they gradually grow to feel that the whole world is nothing but muck their power of usefulness is gone.
Life, too, is like that. You live it forward, but understand it backward. It is only when you stop and look to the rear that you see the corpse caught under your wheel.
Science ... looks skeptically at all claims to knowledge, old and new. It teaches not blind obedience to those in authority but to vigorous debate, and in many respects that's the secret of its success.
Look not at what is contrary to propriety; listen not to what is contrary to propriety; speak not what is contrary to propriety; make no movement which is contrary to propriety.