And how, may I ask, has it become a part of my genius? Simply because nature, of which I am a part, and to which all my ideas must refer if they are to be relevant to my destiny, happens to have mathematical form. Nature had to have some form or other, if it was to exist at all; and whatever form it had happened to take would have had its prior place in the realm of essence, and its essential and logical relations there. That particular part of the realm of essence which nature chances to exemplify or to suggest is the part that may be revealed to me, and that is the predestined focus of all my admirations. Essence as such has no power to reveal itself, or to take on existence; and the human mind has no power or interest to trace all essence. Even the few essences which it has come to know, it cannot undertake to examine exhaustively; for there are many features nestling in them, and many relations radiating from them, which no one needs or cares to attend to. The implications which logicians and mathematicians actually observe in the terms they use are a small selection from all those that really obtain, even in their chosen field; so that, for instance, as Mr. Russell was telling us, it was only the other day that Cantor and Dedekind observed that although time continually eats up the days and years, the possible future always remains as long as it was before. This happens to be a fact interesting to mankind. Apart from the mathematical puzzles it may help to solve, it opens before existence a vista of perpetual youth, and the vital stress in us leaps up in recognition of its inmost ambition. Many other things are doubtless implied in infinity which, if we noticed them, would leave us quite cold; and still others, no doubt, are inapprehensible with our sort and degree of intellect. There is of course nothing in essence which an intellect postulated _ad hoc_ would not be able to apprehend; but the kind of intellect we know of and possess is an expression of vital adjustments, and is tethered to nature. That a few eternal essences, then, with a few of their necessary relations to one another, do actually appear to us, and do fascinate our attention and excite our wonder, is nothing paradoxical. This is merely what was bound to happen, if we became aware of anything at all; for the essence embodied in anything is eternal and has necessary relations to some other essences. The air of presumption which there might seem to be in proclaiming that mathematics reveals what has to be true always and everywhere, vanishes when we remember that everything that is true of any essence is true of it always and everywhere. The most trivial truths of logic are as necessary and eternal as the most important; so that it is less of an achievement than it sounds when we say we have grasped a truth that is eternal and necessary.