The Simon Wiesenthal Center/Museum of Tolerance is proud to have in its archives, a rare letter, handwritten on personal embossed stationery from Albert Einstein to New York businessman Isidor Zelniker dated June 10, 1939. In the letter, Einstein thanks Zelniker for his work on behalf of European Jewish refugees, offering his "Sincere congratulations... on the splendid work you have undertaken on behalf of the refugees during Dedication Week. The power of resistance which has enabled the Jewish people to survive for thousands of years has been based to a large extent on traditions of mutual helpfulness. In these years of affliction our readiness to help one another is being put to an especially severe test. May we stand this test as well as did our fathers before us. We have no other means of self-defense than our solidarity and our knowledge that the cause for which we are suffering is a momentous and sacred cause." This letter is part of the Simon Wiesenthal Center’s rich archival holdings culled from around the globe.