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.

[A ruler is merely] the trustee of the rights of other men and he must always stand in dread of having in some way violated these rights.

There can be no doubt that all our knowledge begins with experience.

Human reason has the peculiar fate in one species of its cognitions that it is burdened with questions which it cannot dismiss, since they are given to it as problems by the nature of reason itself, but which it also cannot answer, since they transcend every capacity of human reason.

Physicians think they do a lot for a patient when they give his disease a name.

Beauty presents an indeterminate concept of Understanding, the sublime an indeterminate concept of Reason.

In all judgements by which we describe anything as beautiful, we allow no one to be of another opinion.