Look closely. The beautiful may be small.

If justice perishes, human life on Earth has lost its meaning.

Two things strike me dumb: the infinite starry heavens, and the sense of right and wrong in man.

The arts of speech are rhetoric and poetry. Rhetoric is the art of transacting a serious business of the understanding as if it were a free play of the imagination; poetry that of conducting a free play of the imagination as if it were a serious business of the understanding.

Two things fill the mind with ever new and increasing admiration and awe, the oftener and more steadily we reflect on them: the starry heavens above and the moral law within.

Philosophy stands in need of a science which shall determine the possibility, principles, and extent of human knowledge à priori.

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.