Thomas Aquinas,
Summa Theologiae — Question 187 - OF THOSE THINGS THAT ARE COMPETEN TO RELIGIOUS…
“ For watchmen, couriers, and such like who live by their labor, are understood to live by their handiwork: because, since the hand is "the organ of organs" [*De Anima iii, 8] , handiwork denotes all kinds of work, whereby a man may lawfully gain a livelihood. ”
