A 1939 letter Nobel Prize-winning Jewish scientist Albert Einstein wrote advocating for the rescue of Jews from Europe will be auctioned in Los Angeles with an initial 20,000 bid.

The letter, written on Einstein’s personal Princeton stationary, is addressed to Miss Sadye Klein of New York’s Department of Welfare Veteran Relief Division.

“The power of resistance which has enabled the Jewish people to survive for thousands of years has been to a large extent on traditions of mutual helpfulness,” wrote the Nobel laureate. “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.”