Highly intellectual also is his explanation of the necessity of redemption. _Cur Deus Homo?_ (the title of one of his works) asked St. Anselm. Because sin in relation to an infinite God is an infinite crime. Man, finite and limited in capacity, could therefore never expiate it. Then what could God do to avenge His honour and to have satisfaction rendered to Him? He could only make Himself man without ceasing to be God, in order that as man He should offer to God a reparation to which as God He would give the character of infinitude. It was therefore absolutely necessary that at a given moment man should become God, which could only be done upon the condition that God made Himself man. REALISTS; NOMINALISTS; CONCEPTUALISTS.--It was in the time of St. Anselm that there arose the celebrated philosophic quarrel between the "realists, nominalists, and conceptualists." It is here essential to employ these technical terms or else not to allude to the dispute at all, because the strife is above all a war of words. The realists (of whom St. Anselm was one), said: "The ideas (idea of virtue, idea of sin, idea of greatness, idea of littleness) are realities; they exist, in a spiritual manner of course, but they really exist; they are: there is a virtue, a sin, a greatness, a littleness, a reason, etc. (and this was an exact reminiscence of the ideas of Plato). It is indeed only the idea, the general, the universal, which is real, and the particular has only the appearance of reality. Men do not exist, the individual man does not exist; what exists is 'man' in general, and individual men are only the appearance of--the coloured reflections of--the universal man." The nominalists (Roscelin the Canon of Compiegne, for instance) answered: "No; the general ideas, the universals as you say, are only names, are only words, emissions of the voice, labels, if you like, which we place on such and such categories of facts observed by us; there is no greatness; there are a certain number of great things, and when we think of them we inscribe this word 'greatness' on the general idea which we conceive. 'Man' does not exist; there are men and the word humanity is only a word which to us represents a collective idea."