Those who, without any proof systematically force themselves to destroy the idea of God, have done cowardly and unscientific work. I proclaim this will all the more force and conviction in as much as I do not possess the Faith, that truth, which gushes forth from deep without our being. I do not believe in God more than I believe in the reality of evolution or the reality of electrons... And I have the scientific certainty of not being mistaken. Far from being (as other men of science whom I envy) supported and aided by an unshakable faith in God, I went into life with a destructive skepticism that was very much in fashion in those days. I had to spend thirty years in the laboratory in order to arrive at the point of being convinced that those who had the duty of enlightening me, if only by confessing to me their ignorance, had instead deliberately lied to me. My conviction today is rational. I have arrived at it by the pathways of biology and physics and am persuaded that it is impossible for any man of science who reflects not to arrive at this point, unless it be because of blindness or bad faith. And it is so that others may avoid the immense loss of time and the fatigue that I have suffered that I now rise up against the evil spirit of the bad shepherds.
We are not even authorized to consider the exceptional case of archaeopteryx as a true link. By link, we mean a necessary stage of transition between classes such as reptiles and birds, or between smaller groups. An animal displaying characteristics belonging to two different groups cannot be treated as a true link as long as the intermediary stages have not been found, and as long as the mechanisms of transition remain unknown.
Let us admit that no matter how small the chance it could happen, one molecule could be created by such astronomical odds of chance. However, one molecule is of no use. Hundreds of millions of identical ones are necessary. Thus we either admit the miracle or doubt the absolute truth of science.
The wake of Moses, of Buddha, of Confucius, of Lao Tse, of Christ, probably exert a greater influence over humanity today than when these men were pondering over its fate and happiness. No man ever disappears completely if he strives to do good and expects no reward outside of the joy of having contributed to the progress of mankind.