A better question would be, should you share your source material? This is the far more helpful question and it's one that doesn't seem to have a concrete answer. You've got to preach week after week and that work is inspired by something. Granted, most will say scripture is your ultimate source material and I'm not arguing with that. I'm talking about the book you've been reading. You know, the one you've found completely inspiring. It's not long before your 5 favorite chapters become your next 5 week teaching series. And we secretly hope no one in our audience reads said book....cause that would be awkward.