Here's my favorite relevant one.
The moral was pointed out over and over again that "there are some things Man was not meant to know."
Even as a youngster, though, I could not bring myself to believe that if knowledge presented danger, the solution was ignorance. To me, it always seemed that the solution had to be wisdom. You did not refuse to look at danger, rather you learned how to handle it safely.
-Isaac Asimov, introduction to
The Caves of Steel
I don't use it in my sig because it would be horribly unfair to scroll through it every time I post.
"Perhaps you should take your furs and your literal interpretations to the other side of the river."
-Anya