"The first duty of the psychological method is to retire within the field of consciousness, where there is nothing but phenomena, that are all capable of being perceived and judged by observation. Now as no substantial existence falls under the eye of consciousness, it follows that the first effect of a rigid application of method is to postpone the subject of ontology. It postpones it, I say, but does not destroy it. It is a fact, indeed, attested by observation, that in this same consciousness, in which there is nothing but phenomena, there are found notions, whose regular development passes the limits of consciousness and attains the knowledge of actual existences. Would you stop the development of these notions? You would then arbitrarily limit the compass of a fact, you would attack this fact itself, and thus shake the authority of all other facts. We must either call in question the authority of consciousness in itself, or admit this authority without reserve for all the facts attested by consciousness. The reason is no less certain and real than the will or the sensibility; its certainty once admitted we must follow it wherever it rigorously conducts, though it be even into the depths of ontology. For example, it is a rational fact attested by consciousness, that in the view of intelligence, every phenomenon which is presented supposes a cause. It is a fact, moreover, that this principle of causality is marked with the characteristics of universality and necessity. If it be universal and necessary, to limit it would be to destroy it. Now in the phenomenon of sensation, the principle of causality intervenes universally and necessarily, and refers this phenomenon to a cause; and our consciousness testifying that this cause is not the personal cause which the will represents, it follows that the principle of causality in its irresistible application conducts to an impersonal cause, that is to say, to an external cause, which subsequently, and always irresistibly, the principle of causality enriches with the characteristics and laws, of which the aggregate is the Universe. Here then is an existence; but an existence revealed by a principle which is itself attested by consciousness. Here is a primary step in ontology, but by the path of psychology, that is to say, of observation. We are led by similar processes to the Cause of all causes, to the substantial Cause, to God; and not only to a God of Power, but to a God of Justice, a God of Holiness; so that this experimental method, which, applied to a single order of phenomena, incomplete and exclusive, destroyed ontology and the higher elements of consciousness, applied with fidelity, firmness and completeness, to all the phenomena, builds up that which it had