The instinct of destruction is essentially connected with the instinct of creation and indeed must be regarded as an indirect expression of that instinct; for, as one can clearly understand, almost every creative undertaking implies some kind of destructive or at least some kind of suppressive or renunciant act which renders such an undertaking possible. In the same way it is not difficult to see that the simple impulse of natural sensuality, or direct animal lust, is profoundly connected with the creative instinct, and is indeed the expression of the creative instinct on the plane of purely material energy. But it must be understood, however, that neither the will to destruction nor the will to sensuality are by any means always as innocent as the forms of them I have indicated above. It often happens indeed that this destructive instinct is profoundly penetrated by malice and derives the thrill of its activity from malice; and this may easily be observed in certain famous but not supreme works of art. It must also be understood that the impulse to sensuality or lust is not always the direct simple animal instinct to which I have referred. What has come to be called "Sadism" is an instance of this aberration of an innocent impulse. The instinct of "sadism," or the deriving of voluptuous pleasure from sensual cruelty, has its origin in the legitimate association of the impulse to destroy with the impulse to create, as these things are inseparably linked together in the normal "possession" of a woman by a man. In such "possession" the active masculine principle has to exercise a certain minimum of destruction with a view to a certain maximum of creation; and the normal resistance of the female is the mental corollary of this. The normal resistance of the artist's medium to the activity of his energy is a sort of aesthetic parallel to this situation; and it is easy to see how, in the creation of a work of art, this aesthetic overcoming of resistance may get itself mentally associated with the parallel sensation experienced on the sensual plane. The point we have to make is this: that while in normal cases the impulse to sensuality is perfectly direct, innocent, animal, and earth-born; in other cases it becomes vitiated by the presence in it of a larger amount of destructive energy than can be accounted for by the original necessity.