Physical science is like simple addition: it is either infallible or it is false.

Every one of the great revolutionists, from Isaiah to Shelley, have been optimists. They have been indignant, not about the badness of existence, but about the slowness of men in realizing its goodness.

I owe my success to having listened respectfully to the very best advice, and then going away and doing the exact opposite.

Man must have just enough faith in himself to have adventures, and just enough doubt of himself to enjoy them.

Each generation is converted by the saint who contradicts it most.

There is no way in which a man can earn a star or deserve a sunset.

Catholic doctrine and discipline may be walls; but they are the walls of a playground.