Quote by Russell, Bertrand
"I have never felt surer that a thing was true than I have about the proposition that 2+2=4, yet I have come to learn that mathematics as a whole cannot be said to be known with certainty."
More from Russell, Bertrand
"Do not fear to be eccentric in opinion, for every opinion now accepted was once eccentric."
"The only thing that will redeem mankind is cooperation."
"What is wanted is not the will to believe, but the wish to find out, which is the exact opposite of the will to believe."
"Fear is the main source of superstition, and one of the main sources of cruelty."