§ 6. The conclusion we have reached so far is largely identical with that of the anti-materialistic argument of Berkeley’s well-known _Principles of Human Knowledge_ and _Three Dialogues between Hylas and Philonous_. But there is one important difference between the two results which will lead to momentous consequences. Berkeley’s argument against the independent existence of unperceived matter proceeds throughout on the principle that to be means to be present in an experience, and his exhibition of the contradictions into which the denial of this principle leads the supporter of scientific materialism remains the classic demonstration of the truth of the opposing or “idealistic” view. But it is to be noted that he works throughout with an inadequate conception of “experience” and “presence in experience.” He treats experience as equivalent to mere passive “awareness” of a quality presented to perception. To experience with him means simply to be conscious of a presented quality; experience is treated as having, in psychological terminology, a merely presentational character. Hence he is led to infer that the things with which experience confronts us are nothing more than complexes of presented qualities, or, as he phrases it, that their whole being consists in being perceived. The full extent of the paradox which this identification of the _esse_ of material things with _percipi_ involves, will be more apparent when we come to deal in our next book with the problem of matter. At present I merely wish to call attention to one of its many aspects. On the theory that experience is purely passive and presentational, consisting merely in the reception of certain sensations, the question at once arises, What determines what in particular the sensations we at any given moment receive shall be? On the Berkeleian view, their order must be determined altogether from without by a principle foreign to the experience which, he assumes, has nothing to do but to cognise the qualities put before it. Hence he is led to appeal to the agency of God, whom he supposes directly and immediately to cause perceptions to succeed one another in my experience in a certain definite order. Now, apart from further difficulties of detail, this doctrine at once leads to the result that the attitude of God to the world of things is totally different from that of us who experience it. Experience is to me a purely passive receptivity of presentations; God’s relation to the presented objects, on the other hand, is one of active production. There is no common element in these fundamentally contrasted relations; hence it is really a paralogism when Berkeley allows himself to bring God under the same categories which he applies to the interpretation of human experience, and to attribute to Him a consciousness of the things which have been declared to be only the presentations His agency raises in the human mind.[40]