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The assumption of an unconscious is, moreover, a perfectly legitimate one, inasmuch as in postulating it we are not departing a single step from our customary and generally accepted mode of thinking. Consciousness makes each of us aware only of his own states of mind; that other people, too, possess a consciousness is an inference which we draw by analogy from their observable utterances and actions, in order to make this behaviour of theirs intelligible to us. (It would no doubt be psychologically more correct to put it in this way: that without any special reflection we attribute to everyone else our own constitution and therefore our consciousness as well, and that this identification is a sine qua non of our understanding.) This inference (or this identification) was formerly extended by the ego to other human beings, to animals, plants, inanimate objects and to the world at large, and proved serviceable so long as their similarity to the individual ego was overwhelmingly great; but it became more untrustworthy in proportion as the difference between the ego and these ‘others’ widened. To-day, our critical judgement is already in doubt on the question of consciousness in animals; we refuse to admit it in plants and we regard the assumption of its existence in inanimate matter as mysticism. But even where the original inclination to identification has withstood criticism - that is, when the ‘others are our fellow-men - the assumption of a consciousness in them rests upon an inference and cannot share the immediate certainty which we have of our own consciousness.

Psycho-analysis demands nothing more than that we should apply this process of inference to ourselves also - a proceeding to which, it is true, we are not constitutionally inclined. If we do this, we must say: all the acts and manifestations which I notice in myself and do not know how to link up with the rest of my mental life must be judged as if they belonged to someone else: they are to be explained by a mental life ascribed to this other person. Furthermore, experience shows that we understand very well how to interpret in other people (that is, how to fit into their chain of mental events) the same acts which we refuse to acknowledge as being mental in ourselves. Here some special hindrance evidently deflects our investigations from our own self and prevents our obtaining a true knowledge of it.