Promiscuous reading is necessary to the constituting of human nature. The attempt to keep out evil doctrine by licensing is like the exploit of that gallant man who thought to keep out the crows by shutting the park gate.

-Milton,John
  Areopagitica: a speech for the liberty of unlicensed printing.

He seemed For dignity composed and high exploit: But all was false and hollow; though his tongue Dropped manna, and could make the worse appear The better reason.

-Milton,John
  Of Belial. Paradise Lost (published1667), bk.2, l.110^14.