The view is often defended that sciences should be built up on clear and sharply defined basal concepts. In actual fact no science, not even the most exact, begins with such definitions. The true beginning of scientific activity consists rather in describing phenomena and then in proceeding to group, classify and correlate them.
Sigmund FreudFree sexual intercourse between young males and respectable girls" was urgently necessary or society was "doomed to fall a victim to incurable neuroses which reduce the enjoyment of life to a minimum, destroy the marriage relation and bring hereditary ruin on the whole coming generation.
Sigmund FreudThe ego is first and foremost a bodily ego; it is not merely a surface entity, but is itself the projection of a surface. If we wish to find an anatomical analogy for it we can best identify it with the 'cortical homunculus' of the anatomists, which stands on its head in the cortex, sticks up its heels, faces
Sigmund FreudThinking in pictures is, therefore, only a very incomplete form of becoming conscious. In some way, too, it stands nearer to unconscious processes than does thinking in words, and it is unquestionably older than the latter both ontogenetically and phylogenetically.
Sigmund Freud