of existence. Thereafter, however, he corrected this opinion, no
longer maintaining that the same quality was the essence of all
things, but that, rather, it manifested itself in them through
diverse ways. This problem of universals is ever the most vexed one
among logicians, to such a degree, indeed, that even Porphyry,
writing in his "Isagoge" regarding universals, dared not attempt a
final pronouncement thereon, saying rather: "This is the deepest of
all problems of its kind." Wherefore it followed that when William
had first revised and then finally abandoned altogether his views
on this one subject, his lecturing sank into such a state of
negligent reasoning that it could scarce be called lecturing on the
science of dialectics at all; it was as if all his science had been
bound up in this one question of the nature of universals.

Thus it came about that my teaching won such strength and authority
that even those who before had clung most vehemently to my former
master, and most bitterly attacked my doctrines, now flocked to my
school. The very man who had succeeded to my master's chair in the
Paris school offered me his post, in order that he might put
himself under my tutelage along with all the rest, and this in the
very place where of old his master and mine had reigned. And when,
in so short a time, my master saw me directing the study of
dialectics there, it is not easy to find words to tell with what
envy he was consumed or with what pain he was tormented. He could
not long, in truth, bear the anguish of what he felt to be his
wrongs, and shrewdly he attacked me that he might drive me forth.
And because there was nought in my conduct whereby he could come at
me openly, he tried to steal away the school by launching the
vilest calumnies against him who had yielded his post to me, and by
putting in his place a certain rival of mine. So then I returned to