The numbers may be said to rule the whole world of quantity, and the four rules of arithmetic may be regarded as the complete equipment of the mathematician.

You don't have to be a mathematician to have a feel for numbers.

Do not rectify a rule by breaking rules...

All the mathematical sciences are founded on relations between physical laws and laws of numbers, so that the aim of exact science is to reduce the problems of nature to the determination of quantities by operations with numbers.

It is the weight, not numbers of experiments that is to be regarded.

Mathematicians may flatter themselves that they possess new ideas which mere human language is as yet unable to express.