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.

The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data.

Far better an approximate answer to the right question, which is often vague, than the exact answer to the wrong question, which can always be made precise.

Be approximately right rather than exactly wrong.

To be able to say that "if we change our point of view in the following way ... things are simpler" is always a gain.

Numerical quantities focus on expected values, graphical summaries on unexpected values.

If we are going to make a mark (key 21), it might as well be a meaningful one.