Man's greatest concern is to know how he shall properly fill his place in the universe and correctly understand what he must be in order to be a man.

In every department of physical science there is only so much science, properly so-called, as there is mathematics.

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.

It is not God's will merely that we should be happy, but that we should make ourselves happy

The greatest problem for the human species, the solution of which nature compels him to seek, is that of attaining a civil society which can administer justice universally.

The schematicism by which our understanding deals with the phenomenal world ... is a skill so deeply hidden in the human soul that we shall hardly guess the secret trick that Nature here employs.

Rules for Happiness: something to do, someone to love, something to hope for.