All generalizations are false, including this one.

One can enjoy a rainbow without necessarily forgetting the forces that made it.

A powerful agent is the right word: it lights the reader's way and makes it plain.

You can't reason someone out of something that they weren't reasoned into in the first place.

We don't cut up when mad men are bred by the old legitimate regular stock religions, but we can't allow wildcat religions to indulge in such disastrous experiments.

And always we had wars, and more wars, and still other wars - all over Europe, all over the world. "Sometimes in the private interest of royal families," Satan said, "sometimes to crush a weak nation; but never a war started by the aggressor for any clean purpose - there is no such war in the history of the race."

None but an ass pays a compliment and asks a favour at the same time. There are many asses.