"Extremism thrives amid ignorance and anger, intimidation and cowardice."

"A thousand years ago, everybody knew the Earth was the center of the universe. Five hundred years ago, they knew the Earth was flat. Fifteen minutes ago, you knew we humans were alone on it. Imagine what you'll know tomorrow."

"A little knowledge is a dangerous thing. Drink deep, or taste not the Pierian spring."

"How wonderful, how very wonderful the operations of time, and the changes of the human mind!"

"How clever you are, to know something of which you are ignorant."

"Civilization is human rights, it is the path of setting man free from men, phobia, to survive it, we must cultivate the science of human relationships."