Immaturity is the incapacity to use one's intelligence without the guidance of another.

Immaturity is the incapacity to use one's intelligence without the guidance of another.

Thoughts without content are empty, intuitions without concepts are blind.

Experience without theory is blind, but theory without experience is mere intellectual play.

Always recognize that human individuals are ends, and do not use them as means to your end.

Metaphysics is a dark ocean without shores or lighthouse, strewn with many a philosophic wreck.