Some split between the inner world and outer world is common to all behaviour, and the need to bridge the gap is the source of creative behaviour.

It's not psychopathology that counts. It's what you do with it.

When a man suffers from delusions he is described as mad but when a million do so they belong to a world religion

Had [Winston Churchill] been a stable and equable man, he could never have inspired the nation. In 1940, when all the odds were against Britain, a leader of sober judgment might well have concluded that we were finished.

The sane are madder than we think, the mad saner.

One man's faith is another man's delusion

If creative work protects a man against mental illness, it is small wonder that he pursues it with avidity; and even if the state of mind he is seeking to avoid is no more than a mild state of depression or apathy, this still constitutes a cogent reason for engaging in creative work even when it brings no obvious external benefit in its train.