Tobacco is the only excuse for Columbus's misadventure in discovering America.

Dreams are often most profound when they seem the most crazy.

The conscious mind may be compared to a fountain playing in the sun and falling back into the great subterranean pool of subconscious from which it rises.

These [religious ideas] are given out as teachings, are not precipitates of experience or end-results of thinking: they are illusions, fullfilments of the oldest, strongest and most urgent wishes of mankind.

Illusions commend themselves to us because they save us pain and allow us to enjoy pleasure instead.

A state of consciousness is characteristically very transitory; an idea that is conscious now is no longer so a moment later, although it can become so again under certain conditions that are easily brought about.

Whatever fosters the growth of civilization works at the same time against war.