but stick with that guideline. try to be generous and 10% is a good guideline but it's not a legal requirement of the new testament. >> gentlemen, this is a really interesting topic and debate. we all know some people who certainly want to give and do give to the church but many stick to that 10% religiously. mr. anderson, mr. kluth, i appreciate you all spending some time with us on what i know are always busy sundays for you guys but you enjoy the rest of the weekend. >> thank you. >> isn't that something? "faces of faith" this is the only segment i get where someone actually says "god bless you" at the end of it. go to cnn's belief blog at cnn.com/belief. can you believe what some of those visitors to the lincoln memorial saw yesterday? they saw president obama. had he a surprise for them. yes. there he is, running up the steps. but they weren't the only ones in the dark about his visit. some behind-the-scenes when we come back. also, cate middleton may be