(Canto 11, lines 106-108)
"These two" are then nature and art (which here and, as often in Aristotle, seems to be a synonym for "work"). Compare Genesis, where God creates the living things, man and woman in Chapter 1, in Chapter 2 puts them in the Garden of Eden to overlook all, and in then, in Chapter 3, tells Adam that "in the sweat of thy face shalt thou eat bread". See further 2 Thessalonians 3:10, where Paul writes "if any would not work, neither should he eat." In short, people should earn their living by honest work, not like the usurer "take another way".