No one, in the world's whole history, ever attempted to substantiate a truth by a miracle. Truth scorns the assistance of miracle. Nothing but falsehood ever attested itself by signs and wonders. No miracle ever was performed, and no sane man ever thought he had performed one, and until one is performed, there can be no evidence of the existence of any power superior to, and independent of nature.

Christianity has made more lunatics than it ever provided asylums for.

The history of intellectual progress is written in the lives of infidels.

In the search for truth - that everything in nature seems to hide - man needs the assistance of all his faculties. All the senses should be awake.

The only evidence, so far as I know, about another life is, first, that we have no evidence; and secondly, that we are rather sorry that we have not, and wish we had.

My heart was filled with gratitude, with thankfulness, and went out in love to all the heroes, the thinkers who gave their lives for the liberty of hand and brain... to all the wise, the good, the brave of every land, whose thoughts and deeds have given freedom to the sons of men. And then I vowed to grasp the torch that they had held, and hold it high, that light might conquer darkness still.

The only reason why we wish to exchange thoughts is that we are different. If we were all the same, we would die dumb. No thought would be expressed after we found that our thoughts were precisely alike. We differ-our thoughts are different. Therefore the commerse that we call conversation.