Marie-Louise von Franz

On doubt from the book  Alchemical Active Imagination

"We never believe one and the same thing throughout a single day. Usually people are thrown about by moods. They listen to somebody who says that what they believe is all nonsense, and again they are convinced. Through outer influences one gets thrown about; one minute one knows something and the next minute one doubts it, and so one never really has one's weltanschauung. As one philosopher said. "In the morning I am always a Kantian, and in the evening I believe in Nietzsche!""