In "On How Logic Became First-Order" Matti Eklund writes (p. 2/148):
It appears to be widely held today that arguments from Skolem and Kurt Gödel, both alleged proponents of the thesis that standard firstorder logic is “the logic” (or, if you like, “the true logic” or “the correct logic”; below I will say something about just what preferring first-order logic as “the” logic might come to), had notable impact on the development toward first-order logic
Furthermore, in the book "Foundations without Foundationalism" by Shapiro it is written (page xiii):
Historically, the main proponents of first-order logic were Skolem, von Neumann, Weyl, and Gödel
Where did Gödel stated that first-order logic is the "true" logic? Were did he assert his opinion on this topic? Is there a paper in which he described his opinion? If not: Then, from where do we know that he had this opinion? Are there sources (a interview for example)? Can you give me some references?
(I' m also interested in the same questions with "Gödel" replaced by "Skolem". But for most, I' m interested in Gödel)