My friends, what do you know about angels? Did you ever see an angel? You probably never did. Did you ever hear a sermon on angels to explain what angels are? Who are angels, are there any such things? Do they exist, or it is a superstition? What are angels? Why are angels? If there are any, what's their function? What do they do and how do we know? Now, I'm quite sure that no scientist ever caught one in his laborat ...