Every human being should always be treated as an end and never as a mere instrument.

Innocence is indeed a glorious thing; but, unfortunately, it does not keep very well and is easily led astray.

Criticism alone can sever the root of materialism, fatalism, atheism, free-thinking, fanaticism, and superstition, which can be injurious universally; as well as of idealism and skepticism, which are dangerous chiefly to the Schools, and hardly allow of being handed on to the public.

THERE ARE TWO THINGS that don't have to mean anything, one is music and the other is laughter.

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

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

Always regard every man as an end in himself, and never use him merely as a means to your ends [i.e., respect that each person has a life and purpose that is their own; do not treat people as objects to be exploited].