Hi Donvic
You’ve posted this in the “Rocks/Gems” forum, but I expect one of the mods will move it for you to a more appropriate section.
Can you kindly clarify some things here?
What exactly does “I found it behind a picture of a lady posing black and white picture”. Do you mean it was actually mounted/framed behind that picture; or do you mean you were browsing through a box of pictures, one was behind the other in the box and you bought them both?
Also, where does the piece of paper with “quotation from Chapter 1 of Exhortation to the Greeks” fit into all of this? Is that actually printed on the same piece of paper as either of the pictures (front or back); or is it on a separate piece of paper to the drawings and used as a backing sheet for mounting purposes?
I would assume that it’s a reference to the work of that name by the 2nd Century theologian Clement of Alexandria, for which several published English translations exist (notably Butterworth in 1919)… although Chapter I contains nothing “quotable” which might relate to the history of the female nude in the world of art or anything of that kind.
The “black and white picture” is a print of Henri Matisse’s work “Seated Female Nude, Holding One Knee, with Sketch of a Foot” executed in August 1909, for which the original has been in the Chicago Art Institute collection since 1926:
View attachment 2050097
I don’t recognise the other work (and the signature is unreadable) but it would be a little odd for an original to be mounted behind a cheap print… if that’s what you actually meant.