Please note that I do NOT want to discuss whether gravity is a force or the effect of space-time curvature here. If you want to discuss this, please post a separate topic about it. What I wanted to ask is what Einstein's own beliefs on this were. Up till now I had always believed he had postulated gravity to be the effect of space-time curvature rather than a natural force akin to electromagnetism. However, I just read: Which was written in the following article: http://www.indopedia.org/Tom_Van_Flandern.html (the subject matter of which I wish NOT to discuss here). They give the following source:  A. Einstein (1920), Ether and the theory of relativity, Springer, Berlin, reprinted Dover (1983), 23. However, everywhere else I have always read otherwise. Is this but a widespread myth? If you reply, please adduce external sources.