If you want to find out anything from the theoretical physicist about the methods they use, I advise you to stick closely to one principle: don’t listen to their words, fix your attention on their deeds.(1)
The above-mentioned elements (his thought process – Y.S.) are, in my case, of visual and some of muscular type. Conventional words or other signs have to be sought for laboriously only in a secondary stage, when the mentioned associative play is sufficiently established and can be reproduced at will.(2)
1) From “On the Methods of Theoretical Physics,” Herbert Spenser Lecture, Oxford, June 10, 1933.
2) From The Mathematician’s Mind, Jacques Hadamard