It is, of course, almost impossible for a non-mathematical brain to be able to comprehend processes which are essentially mathematical. However, I cannot agree with the criticisms that the ancient philosophical form of this doctrine was no more than a guess. Certain mental powers of insight into the nature of things were developed by a few ancient philosophers through concentration and reflection. By the exercise of these powers they arrived at a result which is different only in form, but not in essence, from the modern theory of Relativity.

-- NotebooksCategory 19: The Reign of Relativity > Chapter 1: The Cosmos of Change > # 33