“Throw one arch at least over the darker gulf of ignorance which surrounds us.”

“The fuel on which science runs is ignorance. Science is like a hungry furnace that must be fed logs from the forests of ignorance that surround us. In the process, the clearing we call knowledge expands, but the more it expands, the longer its perimeter and the more ignorance comes into view.”

“An ordinary man can...surround himself with two thousand books...and thenceforward have at least one place in the world in which is is possible to be happy.”

“An ordinary man can surround himself with two thousand books and thenceforward have at least one place in the world in which it is always possible to be happy.”

“Any ordinary man can...surround himself with two thousand books...and thenceforward have at least one place in the world in which it is possible to be happy.”

“Aren't there gradations of evil? Is evil a great perilous gulf into which one falls with the first sin, plummeting to the depth?”