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

The best causes tend to attract to their support the worst arguments, which seems to be equally true in the intellectual and in the moral sense.

We have usually no knowledge that any one factor will exert its effects independently of all others that can be varied, or that its effects are particularly simply related to variations in these other factors.

... the actual and physical conduct of an experiment must govern the statistical procedure of its interpretation.

We may consequently state the fundamental theorem of Natural Selection in the form: The rate of increase in fitness of any organism at any time is equal to its genetic variance in fitness at that time.

We can set no limit to human potentialities; all that is best in man can be bettered; it is not a question of producing a highly efficient machine, ... but of quickening all the distinctly human features, all that is best in man, all the different qualities, some obvious, some infinitely subtle, which we recognize as humanly excellent.

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