The same holds good of sensation. For though the physical object sets up changes in the sense-organ, and is related to it as other physical agencies are related to the things on which they act, still, the sensation implies, over and above the organic change, a subjective activity of which the external activity is altogether devoid. Likewise, we say that a man is at the right of a pillar because, with his power of locomotion, he can take his stand at the right or the left, before or behind, above or below. But obviously these relations, vary them as we will, imply nothing in the stationary pillar, though they are real in the man who holds or changes his position. Once more, a coin has nothing to do with the action that gives it its value, since this action is a human convention; and a man is quite apart from the process which produces his image. Between a man and his portrait there is a relation, but this is real in the portrait only. Between the coin and its current value there is a relation, but this is not real in the coin. Now for the application. God's action is not to be understood as going out from Him and terminating in that which He creates. His action is Himself; consequently altogether apart from the genus of created being whereby the creature is related to Him. And again, he gains nothing by creating, or, as Avicenna puts it, His creative action is in the highest degree generous. It is also manifest that His action involves no modification of His being--without changing, He causes the changeable. Consequently, though creatures are related to Him, as effects to their cause, He is not really related to them. ON THE PRODUCTION OF LIVING THINGS From the 'Quæstiones Disputatæ'