I assert that, in any particular natural science, one encounters genuine scientific substance only to the extent that mathematics is present.

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

Beneficence is a duty.

Nature does nothing in vain, and in the use of means to her goals she is not prodigal.

Two things awe me most, the starry sky above me and the moral law within me.

But a lie is a lie, and in itself intrinsically evil, whether it be told with good or bad intents.

Sincerity is the indispensable ground of all conscientiousness, and by consequence of all heartfelt religion.