Okay, this is bugging me so I’m going to crowdsource it. Who first wrote this:
Teleology is a mistress without whom no biologist can live, but with whom none wishes to be seen in public?
There are many versions of this, ascribed variously to J. B. S. Haldane, Frits Went, but I’m fairly sure it was Ernst von Brücke. One source cites Asa Gray as the origin of the quote. Another has the following:
Once he has grasped this, he will no longer have to look at teleology as a lady without whom he cannot live but with whom he would not appear in public. E. von Brücke
Others just give the quote, in various versions. Any ideas? I cannot find a source, and I even went to online versions of his works in German.