Prager: "It is a moral obligation to cite the source of your ideas."

I have gotten much of my worldview, or possibly it should be characterized as "way of looking at certain issues" from my reading. Often I cite the source because I can remember which book I read it in. But all too often it came from someone I was talking to and I can't even remember where, never mind whom I was talking to.

What do you do then? I just say, "I was chatting with someone I used to know, and she said..." That's often the best I can do.