Yet, even before Brown-Sequard's first epoch-making suggestion had set physiologists to search for internal secretions, the insight of certain physicians on the medico-psychological side was independently leading towards the same dynamic conception.

In the middle of the last century Anstie, an acute London physician, more or less vaguely realised the transformations of sexual energy into nervous disease and into artistic energy.

James Hinton, whose genius rendered him the precursor of many modern ideas, had definitely grasped the dynamic nature of sexual activity, and daringly proposed to utilise it, not only as a solution of the difficulties of the personal life but for the revolutionary transformation of morality.[5] It was the wish to group together all the far-flung manifestations of the inner irresistible process of sexual activity that underlay my own conception of _auto-erotism_, or the spontaneous erotic impulse which arises from the organism apart from all definite external stimulation, to be manifested, or it may be transformed, in mere solitary physical sex activity, in dreams of the night, in day-dreams, in shapes of literature and art, in symptoms of nervous disorder such as some forms of hysteria, and even in the most exalted phases of mystical devotion.

Since then, a more elaborate attempt to develop a similar dynamic conception of sexual activity has been made by Freud; and the psycho-analysts who have followed him, or sometimes diverged, have with endless subtlety, and courageous thoroughness, traced the long and sinuous paths of sexual energy in personality and in life, indeed in all the main manifestations of human activity.
[5] "The man who separated the thought of chastity from Service and made it revolve round Self," wrote Hinton half a century ago in his unpublished MSS., "betrayed the human race." "The rule of Self," he wrote again, "has two forms: Self-indulgence and Self-virtue; and Nature has two weapons against it: pain and pleasure....

A restraint must always be put away when another's need can be served by putting it away; for so is restored to us the force by which Life is made....