The truth knocks on the door and you say, go away, I'm looking for the truth, and it goes away. Puzzling.

We want to make good time, but for us now this is measured with the emphasis on "good" rather than on "time".

You look at where you're going and where you are and it never makes sense, but then you look back at where you've been and a pattern seems to emerge.

The real purpose of the scientific method is to make sure nature hasn’t misled you into thinking you know something you actually don’t know.

One thing about pioneers that you don't hear mentioned is that they are invariably, by their nature, mess-makers. They go forging ahead, seeing only their noble, distant goal, and never notice any of the crud and debris they leave behind them.

I think metaphysics is good if it improves everyday life; otherwise forget it.

The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed.