Printer's ink has been running a race against gunpowder these many, many years. Ink is handicapped, in a way, because you can blow up a man with gunpowder in half a second, while it may take twenty years to blow him up with a book. But the gunpowder destroys itself along with its victim, while a book can keep on exploding for centuries.
A doctor is advertised by the bodies he cures. My business is advertised by the minds I stimulate. And let me tell you that the book business is different from other trades. People don't know they want books. I can see just by looking at you that your mind is ill for lack of books but you are blissfully unaware of it!