34. Consent Requisite for a Human Act.--To be human, an act must proceed not only from knowledge, but also from inclination; that is, it must be voluntary. Three things are necessary in order that an act be voluntary: (a) it must be agreeable to an internal principle, i.e., in most moral matters to the will. Hence, an act that is done against one’s will on account of external violence is not voluntary; (b) it must be caused by the will. Hence, a shower of rain is said to be agreeable to the gardener, but not voluntary since his will is not its cause; (c) it must be performed with a conscious purpose. Hence, natural acts (such as sleeping) and spontaneous acts (such as stroking one’s beard absent-mindedly) are not voluntary acts. 35. Kinds of Voluntary Acts.-(a) A voluntary act is free or necessary, according as one can or cannot abstain from it. The vision of God in heaven is voluntary to the blessed, since they look at Him knowingly and gladly; but it is not free, since they cannot avert their gaze from that which makes them blessed. The love of God on earth is voluntary, since chosen; but it is also free, since man is able to turn away from God. (b) An act is perfectly or imperfectly voluntary, according as the deliberation and consent that precede it are full or only partial. (c) An act is said to be simply--that is, absolutely--voluntary, when it is wished under circumstances that exist here and now, although in itself, apart from those circumstances, it is not wished. It is said to be voluntary under a certain aspect, when it is desired for itself, but not under existing conditions. Thus, if an arm needs to be amputated to save life, the amputation is absolutely voluntary, while the preservation of the arm is voluntary only in a certain respect. Hence, an act is voluntary simply or absolutely when one chooses it, all things considered; it remains involuntary under a certain respect, inasmuch as the choice is made with reluctance. (d) An act is voluntary in itself or directly, when it is desired in itself for its own sake (i.e., as an end), or for the sake of something else (i.e., as a means). It is voluntary in its cause or indirectly, when it is not desired in itself, either as a means or an end, but is foreseen as the result of something else that is intended. Examples: Titus quarrels with his neighbors, at times because he likes to quarrel, and at other times because he wishes to make them fear him; hence, his quarrels are directly voluntary. Caius is a peaceful man who dislikes quarreling; but he likes to drink too much occasionally, although he knows that he always quarrels when he is under the influence of liquor. Thus, his quarrels are indirectly voluntary.