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

Be approximately right rather than exactly wrong.

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

Visualization is often used for evil - twisting insignificant data changes and making them look meaningful. Don't do that crap if you want to be my friend. Present results clearly and honestly. If something isn't working - those reviewing results need to know.

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.

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

It's better to solve the right problem approximately than to solve the wrong problem exactly.