Exerpt from Letter 7:
If science exterminates a disease which has been working for God, it is God that gets the credit, and all the pulpits break into grateful advertising-raptures and call attention to how good he is! Yes, he has done it. Perhaps he has waited a thousand years before doing it. That is nothing; the pulpit says he was thinking about it all the time. When exasperated men rise up and sweep away an age-long tyranny and set a nation free, the first thing the delighted pulpit does is to advertise it as God’s work, and invite the people to pour out their thanks to him….
…in all history there is not an instance where he thought of a noble deed first, but always thought of it just a little after somebody else had thought of it and done it….
All of the Creator’s special deadly disease-producers are invisible. It is an ingenious idea. For thousands of years it kept man from getting at the roots of his maladies, and defeated his attempts to master them. It is only very recently that science has succeeded in exposing some of these treacheries.