Whether a belief is considered to be a delusion or not depends partly upon the intensity with which it is defended, and partly upon the numbers of people subscribing to it.

The word "jealousy" is often used as if it were synonymous with envy; but I think the distinction worth preserving. Jealousy is predominantly concerned with the fear of loss of something one possesses, envy with the wish to own something another possesses. Othello suffers from the fear that he has lost Desdemona's love. Iago suffers from envy of the position held by Cassio, to which he feels entitled.

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

With the exception of certain rodents, no other vertebrate except Homo sapiens habitually destroys members of his own species.

Avoidance behavior is a response designed to protect the infant from behavioral disorganization. If we transfer this concept to adult life, we can see that an avoidant infant might very well develop into a person whose principal need was to find some kind of meaning and order in life which was not entirely, or even chiefly, dependent upon interpersonal relationships

The creative person is constantly seeking to discover himself, to remodel his own identity, and to find meaning in what he creates.

It is true that many creative people fail to make mature personal relationships, and some are extremely isolated. It is also true that, in some instances, trauma, in the shape of early separation or bereavement, has steered the potentially creative person toward developing aspects of his personality which can find fulfillment in comparative isolation. But this does not mean that solitary, creative pursuits are themselves pathological.