A perfect man wd. never act from a sense of duty; he’d always want the right thing more than the wrong one. Duty is only a substitute for love (of God and of other people)–like a crutch at times: but of course it’s idiotic to use the crutch when our own legs (our own loves, tastes, habits, etc) can do the journey on their own!
Now the interesting bit would be to organize and clarify that statement according to Jonathan Edwards. How would The Puritan handle duty? Or rather, what is going on in the human will when the agent chooses according to duty?