In a world in which the price of calculation continues to decrease rapidly, but the price of theorem proving continues to hold steady or increase, elementary economics indicates that we ought to spend a larger and larger fraction of our time on calculation.
John TukeyThe greatest value of a picture is when it forces us to notice what we never expected to see.
John TukeyTo be able to say that "if we change our point of view in the following way ... things are simpler" is always a gain.
John Tukey