“The deepest sin against the human mind is to believe things without evidence.”

“Many people believe that the grains of sand are infinite in multitude ... Others think that although their number is not without limit, no number can ever be named which will be greater than the number of grains of sand. But I shall try to prove to you that among the numbers which I have named there are those which exceed the number of grains in a heap of sand the size not only of the earth, but even of the universe”

“If I believe in God and life after death and you do not, and if there is no God, we both lose when we die. However, if there is a God, you still lose and I gain everything.”

“Men believe themselves to be free, simply because they are conscious of their actions, and unconscious of the causes whereby those actions are determined.”

“He who thinks half-heartedly will not believe in God; but he who really thinks has to believe in God.”

“I do not have enough faith to believe there is no god.”

“It is an absurdity to believe that the Deity has human passions, and one of the lowest of human passions, a restless appetite for applause”