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The provocation to a quarrel is easily found if hidden unconscious forces seek for it, if a deeper cause, acting as a driving power, sets the wheels of passion in motion. A somewhat careful investigation of every quarrel easily brings the conviction that it is invariably the secret, unconscious emotions that bring about the conflict of opinions. The great intensity which their emotions attain is due only to the fact they have represseda series of experiences and feelings. Unconscious sexualmotives lurk behind many quarrels, one might almost say behind most quarrels. Freud has become the founder of a wholly new psychologyby virtue of his discovery of the laws of repressionand of transferencea psychology which will be indispensable the to criminologist of the future.