But the materialist's world is quite simple and solid, just as the madman is quite sure he is sane.

The materialist is sure that history has been simply and solely a chain of causation, just as the interesting person before mentioned is quite sure that he is simply and solely a chicken.

Materialists and madmen never have doubts.
Spiritual doctrines do not actually limit the mind as do materialistic denials.

Even if I believe in immortality I need not think about it.

But if I disbelieve in immortality I must not think about it.