Books, not which afford us a cowering enjoyment, but in which each thought is of unusual daring; such as an idle man cannot read, and a timid one would not be entertained by, which even make us dangerous to existing institution-such call I good books.

Henry David Thoreau
(1817-62)
U.S. philosopher, author, naturalist.
A Week on the Concord and Merrimack Rivers, “Sunday” (1849)
[First Amendent, Second Amendment–I would claim the same sort of criteria is useful when choosing a firearm. — Joe]