ST I-II Q. 18 Aquinas Why are wrong actions wrong?
" We must therefore say that every action has goodness, insofar as it has being; whereas it is lacking in goodness, insofar as it is lacking in something that is due to its fullness of being; and thus it is said to be evil: for instance if it lacks the quantity determined by reason, or its due place, or something of the kind." https://aquinas.cc/la/en/~ST.I-II.Q18.A1.C So, if you smoke a brisket for too long, the action is wrong because it "lacks the quantity determined by reason"--not because the brisket is dry. So, why is it wrong to shake a can of beer before opening it? "Evil acts in virtue of deficient goodness. For if there were nothing of good there, there would be neither being nor possibility of action. On the other hand if good were not deficient, there would be no evil. Consequently the action done is a deficient good, which is good in a certain respect, but simply evil." Shaking a can of beer before opening it has goodness insofar as it has be...