Demons do not exist any more than gods do, being only the products of the psychic activity of man.

An unrestricted satisfaction of every need presents itself as the most enticing method of conducting one's life, but it means putting enjoyment before caution, and soon brings its own punishment.

We are so constituted that we can gain intense pleasure only from the contrast, and only very little from the condition itself.

All elongated objects, such as sticks, tree-trunks and umbrellas(the opening of these last being comparable to an erection) may stand for the male organ...Boxes, cases, chests, cupboards, and ovens represent the uterus...Rooms in dreams are usually women...Many landscapes in dreams, especially any containing breidges or wooded hills, may clearly be recognized as descriptions of the genitals.

Conservatism, however, is too often a welcome excuse for lazy minds, loath to adapt themselves to fast changing conditions.

What is characteristic of illusions is that they are derived from human wishes.

Nature delights in making use of the same forms in the most various biological connections: as it does, for instance, in the appearance of branch-like structures both in coral and in plants, and indeed in some forms of crystal and in certain chemical precipitates.