Here I shall add that the concept of change, and with it the concept of motion, as change of place, is possible only through and in the representation of time. & Motion, for example, presupposes the perception of something movable. But space considered in itself contains nothing movable; consequently motion must be something which is found in space only through experience -in other words, is an empirical datum.

The busier we are, the more acutely we feel that we live, the more conscious we are of life.

The instruction of children should aim gradually to combine knowing and doing. Among all sciences mathematics seems to be the only one of a kind to satisfy this aim most completely.

The two great dividers are religion and LANGUAGE

All human knowledge begins with intuitions, proceeds from thence to concepts, and ends with ideas.

A society that is not willing to demand a life of somebody who has taken somebody else’s life is simply immoral.

The light dove, cleaving the air in her free flight, and feeling its resistance, might imagine that its flight would be still easier in empty space.