A quotation by R A Fisher

Natural selection is a mechanism for generating an exceedingly high degree of improbability.

To call in the statistician after the experiment is done may be no more than asking him to perform a postmortem examination: he may be able to say what the experiment died of.
Indian Statistical Congress, Sankhya, ca 1938.

The analysis of variance is not a mathematical theorem, but rather a convenient method of arranging the arithmetic.