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(4) Whether He is in the highest degree one? _______________________

FIRST ARTICLE [I, Q. 11, Art. 1]

Whether "One" Adds Anything to "Being"?

Objection 1: It seems that "one" adds something to "being." For everything is in a determinate genus by addition to being, which penetrates all genera. But "one" is a determinate genus, for it is the principle of number, which is a species of quantity. Therefore "one" adds something to "being."

Obj. 2: Further, what divides a thing common to all, is an addition to it. But "being" is divided by "one" and by "many." Therefore "one" is an addition to "being."

Obj. 3: Further, if "one" is not an addition to "being," "one" and "being" must have the same meaning. But it would be nugatory to call "being" by the name of "being"; therefore it would be equally so to call being "one." Now this is false. Therefore "one" is an addition to "being."

On the contrary, Dionysius says (Div. Nom. 5, ult.): "Nothing which exists is not in some way one," which would be false if "one" were an addition to "being," in the sense of limiting it. Therefore "one" is not an addition to "being."