My Duden says that both Geschlechts and Geschlechtes are the genitive singular of Geschlecht. Is there some reason for choosing between these two?
I ask because the mathematician Richard Dedekind wrote a letter to a friend in which he used the following quote stating it was from Acts 17:29.
Wir sind göttlichen Geschlechtes, …
But it is not exact. A more modern rendition of Martin Luther’s translation of Acts 17:29, such as Dedekind probably knew best in the 19th century, begins
Da wir nun göttlichen Geschlechts sind, …
Dedekind was familiar with Greek and may have retranslated it for himself. Or of course he may just have misquoted Luther.
But I wonder if the difference in declension makes a difference that I have missed. Do the two mean different things? In case it matters: Dedekind lived most of his life in Braunschweig.