I am glad that Freud has resisted the tendency to represent this principle of Love as the only principle in nature. Unity somehow exercises an evil spell over metaphysicians. It is admitted that in real life it is not well for One to be alone, and I think pure unity is no less barren and graceless in metaphysics. You must have plurality to start with, or trinity, or at least duality, if you wish to get anywhere, even if you wish to get effectively into the bosom of the One, abandoning your separate existence. Freud, like Empedocles, has prudently introduced a prior principle for Love to play with; not Strife, however (which is only an incident in Love), but Inertia, or the tendency towards peace and death. Let us suppose that matter was originally dead, and perfectly content to be so, and that it still relapses, when it can, into its old equilibrium. But the homogeneous (as Spencer would say) when it is finite is unstable: and matter, presumably not being co-extensive with space, necessarily forms aggregates which have an inside and an outside. The parts of such bodies are accordingly differently exposed to external influences and differently related to one another. This inequality, even in what seems most quiescent, is big with changes, destined to produce in time a wonderful complexity. It is the source of all uneasiness, of life, and of love. "Let us imagine [writes Freud][11] an undifferentiated vesicle of sensitive substance: then its surface, exposed as it is to the outer world, is by its very position differentiated, and serves as an organ for receiving stimuli.... This morsel of living substance floats about in an outer world which is charged with the most potent energies, and it would be destroyed ... if it were not furnished with protection against stimulation. [On the other hand] the sensitive cortical layer has no protective barrier against excitations emanating from within.... The most prolific sources of such excitations are the so-called instincts of the organism.... The child never gets tired of demanding the repetition of a game ... he wants always to hear the same story instead of a new one, insists inexorably on exact repetition, and corrects each deviation which the narrator lets slip by mistake.... According to this, _an instinct would be a tendency in living organic matter impelling it towards reinstatement of an earlier condition_, one which it had abandoned under the influence of external disturbing forces--a kind of organic elasticity, or, to put it another way, the manifestation of inertia in organic life.