• Man is not distinguished from [the animals] by a special kind of soul, or by any peculiar and exclusive psychic function, but only by a higher degree of psychic activity, a superior stage of development.

    Ernst Haeckel: Man is not distinguished from [the animals] by a special kind of soul, or by any peculiar and exclusive psychic function, but only by a higher  degree of psychic activity, a superior stage of development.
    ernst haeckel “the riddle of the universe”