I used to attribute this quote to Ayn Rand, but found out recently that was error:
"Men fear thought as they fear nothing else on earth; more than dishonor, destitution, or even death itself! Thought is subversive and radical, anarchical and revolutionary: It is merciless to privilege, established institutions, and comfortable habit. Thought looks into the pit of hell and is not afraid; it is great and swift and free: The light of the world, and the chief glory and duty of man."
Your guess (This is a closed-notebook test, so no sneaky Googling or Binging!)?