75. Hence the necessity of thinking the necessary and eternal is a primitive fact of our mind, and the confusion which we feel in thinking on duration in the abstract, and the inclination to imagine time before the world existed, arise from the necessity of conceiving the eternal,—a necessity, from which our mind cannot emancipate itself so long as it thinks.

76. The basis of the principle of contradiction, the idea of being, is found in our conceptions in an absolute manner; its opposite, the conception of not-being is found only in relation to the contingent, and is a sort of condition implied by contingency.

77. Every thing contingent includes some not-being, so far as contingent it can not be, and therefore its not-being is at least in the order of possibility. But these transitions from not-being to being are not even conceivable without presupposing something existing, necessary, and eternal.

78. Thus in our ideas we find being as absolute, and not-being only as relative; and we can conceive being which has proceeded from not-being, or has begun, only in relation to an absolute being.

79. This relation considered objectively does not seem at first sight to be the relation of causality, but only of succession; but it presents a subjective fact which brings us to the knowledge of the objective truth. Our conceptions of not-being and being are connected in such sort that we cannot conceive the transition from not-being to being without conceiving a pre-existent being: here we find a reflex of objective causality which is revealed to us in subjective facts. Duration, as distinct from things, is a pure imagination; the relation of durations is therefore a relation of beings. True, in this relation of durations we discover only succession, and not intrinsic dependence; but this dependence, though not known intuitively, is represented in the very connection in which we conceive beings in duration. It is certain that we can imagine different series; but that of time is a pure imagination in so far as we conceive it distinct from others. If the series of times disappears, there remains only the series of things: the relation between the terms will be the relation between the things; and what is called the dependence of succession will be the dependence of reality. The real relation of that which passes from not-being to being, with that which is absolutely, is a dependence of causality.

80. Let us imagine any series of realities. A, B, C, D, E, ... M, N, P, Q, R....

The series of times a, b, c, d, e, in so far as distinct from the others, means nothing. In this case it may be eliminated, and all the relations of some of the terms on others will be relations of things, not of time.

Now, it has been demonstrated that a term, D, for example, cannot be conceived as passing from not-being to being, or as beginning, without a relation, and it has been shown that this relation is a real relation of D to any of the terms. It has been objected that D, in order to begin, requires only a term which would make the conception of priority, and consequently, of beginning, possible, which term might be sought in another distinct series; but this is really only to change a name; for, if the term which is necessary for the beginning is found in another series, the cause is found in it also, for in it is found that which is necessary for the effect.

81. All the terms begun presuppose another, either one or more, for we here abstract their unity; therefore we must come at last to one or more terms not begun. Those which have begun could not have begun without the existence of those which have not begun; therefore the existence of these is necessary for the existence of those. Therefore the existence of these last contains the reasons of the beginning of the existence of the others; therefore they contain true causality.

82. The difficulties opposed to this demonstration arise from inadvertently violating the supposition by attributing to duration an existence distinct from the beings. In order to perceive the whole force of the proof, it is necessary to eliminate entirely the imaginary conception of pure duration: and then it will be seen that the dependence represented as the relation of duration is the dependence of the beings themselves,—a dependence which represents nothing else than the relation expressed by the principle of causality.