Letter from Albert Einstein to Louis de Broglie - 13 November 1929

13.XI.29 Dear Mr. De Broglie, It was with great pleasure and satisfaction that I read this morning that you have been awarded the Nobel Prize. I warmly congratulate you on this recognition by the outside world of your wonderful discovery and furthermore wish you luck and success in your search for the truth. We could both tell a tale about how difficult that search is. With kind regards, Yours, A. Einstein