Perhaps as good a classification as any of the main types is that of the three lusts distinguished by traditional Christianity - the lust of knowledge the lust of sensation and the lust of power.
The true humanist maintains a just balance between sympathy and selection.
Belief and knowledge are considered to be two different things. But they are...
The impulse to dream was slowly beaten out of me by experience. Now it surged up again and I hungered for books new ways of looking and seeing.