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 which the power of the Will might exercise itself freely, in such a manner that, although the matter might be determined beforehand, its form was not, and that such an imminent event could be suspended, evaded, or changed by a coöperation of the acts of the will, inaccessible to all prevision. This is what was said with such profoundness by Tiresias, the most famous hierophant of Greece and whom Homer called the only sage, these words so often quoted and so little understood: "Whatever I may see will come to pass, or it will not come to pass" ; that is to say, The event that I see is in the necessity of Destiny and it will come to pass, unless it is changed by the power of the Will; in which case it will not come to pass.

Lysis has enclosed in these two lines the summary of the doctrine of Pythagoras regarding science: according to this philosopher, all science consists of knowing how to distinguish what one does not know and of desiring to learn that of which one knows nothing. Socrates had adopted this idea, as simple as profound; and Plato has consecrated several of his dialogues to its development.

But the distinction between what one does not know and the desire to learn that of which one is ignorant, is a thing much rarer than one imagines. It is the golden mean of science, as difficult to possess as that of virtue, and without which it is, however, impossible to know oneself. For, without knowledge of oneself, how can one acquire knowledge of others? How judge them if one cannot be one's own judge? Pursue this reasoning. It is evident