The three terms, _Reality, Thought_ and _Logic_, and their relations, could be represented by a system of three circles, the one included in the other, and by marking at will as the first term that which includes all, or that which is included in all: R T L or L T R. Limiting ourselves to the first method, the first circle would be Reality, which Thought (the second circle) would think, in the same way that it would in its turn be thought in the third circle, formed by Logic, the Thought of thought, or the Philosophy of philosophy. This graphic symbol is probably destined to some fortune; but the reader must not seek it in our pages, because knowing how much inadequacy, clumsiness and danger it contains, we share the repugnance, almost instinctively felt at such materializations, which seem to be and are of slight value. [Sidenote: _Relation of these three terms._] The vice of that spatial figuration is that it divides into three circles what is three, but three in one, and should consequently be expressed as a triple circle which should also be a single circle, in which all the three coincide; which is geometrically unrepresentable. The relation of Reality, Thought of Reality and Thought of Thought, divided into three circles, legitimately gives rise to the question: Why should there not be a fourth, a fifth, a sixth circle (and so on to infinity) which should include respectively the third, the fourth, the fifth (and so on to infinity)? Why should not a Logic of Logic, or a thought of the thought of thought, and so on, follow the thought of thought, which is Logic? For us, this question raises no objection that need bring us to a halt for a single instant, just because we have never divided the one reality into two or more different realities (matter and spirit, nature and idea, and so on), nor into a series of different realities, the one following the other; but we have conceived it as a system of relations and of correlations, constituting a unity, indeed the only unity concretely thinkable. There is no progress to infinity, when the terms are coincident and correlative; hence to think the thought of thought would not be a new act, but equivalent to thinking thought. The mental act will be new (and any mental act is new) for the individual who accomplishes it in conditions that are always new; but its spiritual form will always be that of Logic, which thinks thought and contains within itself, on its side, the process of reality. Further, the indifference exhibited by the symbol of the triple circle as to the determination of the first as last and the last as first, confirms for us the non-existence of a first that is only first and of a last that is only last; confirms, that is to say, the coincidence of unity in relation that is first and last. Reality is not only thought by thought, but is also thought; and thought is not only thought by Logic, but is also Logic. Those who wish to