"This, too is probable, according to that saying of Agathon: 'It is a part of probability that many improbable things will happen.'" --ARISTOTLE: Poetics.
Imagine the conflict in a mind like Deronda's given not only to feel strongly but to question actively, on the evening after the interview with Mordecai. To a young man of much duller susceptibilities the adventure might have seemed enough out of the common way to divide his thoughts; but it had stirred Deronda so deeply, that with the usual reaction of his intellect he began to examine the grounds of his emotion, and consider how far he must resist its guidance. The consciousness that he was half dominated by Mordecai's energetic certitude, and still more by his fervent trust, roused his alarm. It was his characteristic bias to shrink from the moral stupidity of valuing lightly what had come close to him, and of missing blindly in his own life of to-day the crisis which he recognized as momentous and sacred in the historic life of men. If he had read of this incident as having happened centuries ago in Rome, Greece, Asia Minor, Palestine, Cairo, to some man young as himself, dissatisfied with his neutral life, and wanting some closer fellowship, some more special duty to give him ardor for the possible consequences of his work, it would have appeared to him quite natural that the incident should have created a deep impression on that far-off man, whose clothing and action would have been seen in his imagination as part of an age chiefly known to us through its more serious effects. Why should he be ashamed of his own agitated feeling merely because he dressed for dinner, wore a white tie, and lived among people who might laugh at his owning any conscience in the matter, as the solemn folly of taking himself to seriously?--that bugbear of circles in which the lack of grave emotion passes for wit. From such cowardice before modish ignorance and obtuseness, Deronda shrank.
But he also shrank from having his course determined by mere contagion, without consent of reason; or from allowing a reverential pity for spiritual struggle to hurry him along a dimly-seen path.
What, after all, had really happened? He knew quite accurately the answer Sir Hugo would have given: "A consumptive Jew, possessed by a fanaticism which obstacles and hastening death intensified, had fixed on Deronda as the antitype of some visionary image, the offspring of wedded hope and despair: despair of his own life, irrepressible hope in the propagation of his fanatical beliefs. The instance was perhaps odd, exceptional in its form, but substantially it was not rare. Fanaticism was not so common as bankruptcy, but taken in all its aspects it was abundant enough. While Mordecai was waiting on the bridge for the fulfillment of his visions, another man was convinced that he had the mathematical key of the universe which would supersede Newton, and regarded all known physicists as conspiring to stifle his discovery and keep the universe locked; another, that he had the metaphysical key, with just that hair's-breadth of difference from the old wards which would make it fit exactly. Scattered here and there in every direction you might find a terrible person, with more or less power of speech, and with an eye either glittering or preternaturally dull, on the look-out for the man who must hear him; and in most cases he had volumes which it was difficult to get printed, or if printed to get read. This Mordecai happened to have a more pathetic aspect, a more passionate, penetrative speech than was usual with such monomaniacs; he was more poetical than a social reformer with colored views of the new moral world in parallelograms, or than an enthusiast in sewage; still he came under the same class. It would be only right and kind to indulge him a little, to comfort him with such help as was practicable; but what likelihood was there that his notions had the sort of value he ascribed to them? In such cases a man of the world knows what to think beforehand. And as to Mordecai's conviction that he had found a new executive self, it might be preparing for him the worst of disappointments--that which presents itself as final."