Note 19 — Chapter XI

... I say that a thing is free, which exists and acts solely by the necessity of its own nature. Thus also God understands Himself and all things freely, because it follows solely from the necessity of His nature that He should understand all things. You see I do not place freedom in free decision, but in free necessity. However, let us descend to created things, which are all determined by external causes to exist and operate in a given determinate manner. In order that this may be clearly understood, let us conceive a very simple thing. For instance, a stone receives from the impulsion of an external cause a certain quantity of motion, by virtue of which it continues to move after the impulsion given by the external cause has ceased. The permanence of the stone's motion is constrained, not necessary because it must be defined by the impulsion of an external cause. What is true of the stone is true of an individual, however complicated its nature, or varied its functions, inasmuch as every individual thing is necessarily determined by some external cause to exist and operate in a fixed and determinate manner.

Further conceive, I beg, that a stone, while continuing in motion, should be capable of thinking and knowing, that it is endeavoring, as far as it can, to continue to move. Such a stone, being conscious merely of its own endeavor and not at all indifferent, would believe itself to be completely free, and would think that it continued in motion solely because of its own wish. This is that human freedom, which all boast that they possess, and which consists solely in the fact, that men are conscious of their own desire, but are ignorant of the causes whereby that desire has been determined.[20] ...