for it with death. Now because, according to this, it is just the constant renewal and complete alteration of the intellect for the same will which, as imparting a new view of the world, holds open the path of salvation, and because the intellect comes from the mother, the profound reason may lie here on account of which all nations (with very few and doubtful exceptions) abominate and forbid the marriage of brothers and sisters, nay, even on account of which sexual love does not arise at all between brothers and sisters, unless in very rare exceptions, which depend upon an unnatural perversity of the instinct, if not upon the fact that one of the two is illegitimate. For from a marriage of brothers and sisters nothing could proceed but constantly ever the same will with the same intellect, as both already exist united in both the parents, thus the hopeless repetition of the phenomenon which has already been. But if now, in the particular case and close at hand, we contemplate the incredibly great and yet manifest difference of characters—find one so good and philanthropic, another so wicked, nay, ferocious; again, behold one just, honest, and upright, and another completely false, as a sneak, a swindler, a traitor, an incorrigible scoundrel—there discloses itself to us a chasm in our investigation, for in vain we ponder, reflecting on the origin of such a difference. Hindus and Buddhists solve the problem by saying, “It is the consequence of the deeds of the preceding courses of life.” This solution is certainly the oldest, also the most comprehensible, and has come from the wisest of mankind; but it only pushes the question further back. Yet a more satisfactory answer will hardly be found. From the point of view of my whole teaching, it remains for me to say that here, where we are speaking of the will as thing in itself, the principle of sufficient reason, as merely the form of the phenomenon, is no longer applicable; with it, however, all why and whence disappear. Absolute freedom just consists in this, that something is not subject at all to the principle of sufficient reason, as the principle of all necessity. Such freedom, therefore, only belongs to the thing in itself. And this is just the will. Accordingly, in its phenomenal manifestation, consequently in the _Operari_, it is subject to necessity; but in the _Esse_, where it has determined itself as thing in itself, it is free. Whenever, therefore, we come to this, as happens here, all explanation by means of reasons and consequents ceases, and nothing remains for us but to say that here manifests itself the true freedom of the will, which belongs to it because it is the thing in itself, which, however, just as such, is groundless, _i.e._, knows no why. But on this account all understanding ceases for us here, because all our understanding depends upon the principle of sufficient reason, for it consists in the mere application of that principle.