Duty is for Kant the One and All. Out of the duty of gratitude, he claims, one has to defend and esteem the ancients; and only out of duty has he become a great man. ↗
Mention Hubert Sumlin, as well, because Hubert's a great man, and again, you know, I don't play the guitar very good, but when I'm playing this kind of music, I always have him in my mind. I wish I could play like Hubert. ↗
It is a grand mistake to think of being great without goodness and I pronounce it as certain that there was never a truly great man that was not at the same time truly virtuous. ↗