If self-analysis made Freud a relatively adjusted man, it never blunted the sharpness of his search for understanding. He was too restless an explorer to remain content with his theories, worked until his death on amendments and additions. He was far less tolerant toward others' discontent with his theories, bitterly opposed some followers' deviations, but might well have accepted others that have developed since. Some rudiments of the Freudian main theme and principal variations:

Sigmund Freud held that the nature of man is essentially biological; man is born with certain instinctual drives. Most notable: the drive toward self-gratification. Basic mental energy, or...

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