Be approximately right rather than exactly wrong.

I know of no person or group that is taking nearly adequate advantage of the graphical potentialities of the computer.

There is no data that can be displayed in a pie chart, that cannot be displayed BETTER in some other type of chart.

The greatest value of a picture is when it forces us to notice what we never expected to see.

In a single sentence the moral is: admit that complexity always increases, first from the model you fit to the data, thence to the model you use to think about and plan about the experiment and its analysis, and thence to the true situation.

An approximate answer to the right problem is worth a good deal more than an exact answer to an approximate problem.

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