There is no essential difference between the material of comedy and tragedy. All depends on the point of view of the dramatist, which, by clever emphasis, he tries to make the point of view of his audience.
After all those years of doing a live, hour-and-a-half show every week, I've got nothing more I need to prove.
I see it as my job to try to keep Bach in the mainstream and present his music with, rather than without, its emotional core.