It is well known that, in the profundities of science and the principles of the arts, there is little difference between the learned of different classes. Those who practise the various arts are equal, or nearly equal. If one professor outdistances another, it is only by a few steps; and if one artist outstrips another, it is only by a short distance. But where one sees a true difference among the classes, where they make every effort to surpass each other, where there is true emulation and rivalry, there one finds real inferiors and superiors, of the sort that there is among those who pursue the same career from incomprehensible distances, distances so great that one alone balances a thousand others. There are, in the sciences as in the arts, the beauties of certain delicate points; there are subtle thoughts which arouse the wisdom of reflective spirits, profound, hidden secrets covered with veils which very few men, even among those of the most distinguished talent, can lift, secrets which can only be discovered and brought to light by those who among men of merit are like the pearl placed in the center of the necklace, and like the stone which is set in the gold of the ring. Ordinary men have not the eyes to create such excellences, and are as though chained to their seats by a servile desire to imitate, and can not even flatter themselves that any one will trim the hair from their foreheads[14] and give them freedom. Of all the sciences, that which abounds in the most difficulties, which demands the greatest effort in spirit, which offers the largest number of problems capable of fatiguing the strongest intellect, I mean those extraordinary subtleties from which it is difficult to extricate oneself, which are locked as if in vaults, whose thread is cut and difficult to regain—that science is the interpreting of the Koran. It is a science for which, as has been said by Djahed in his work entitled, "Composition of the Koran," no savants are fitted, and to which they devote their lives without hope of complete success.