A handwritten letter in which Albert Einstein questioned the existence of God is going up for sale on EBay, with bids starting at $3 million.

The “God letter”, which the physicist wrote in German a year before his death in 1955, includes his thoughts on religion, God and tribalism.

Einstein sent the letter, written on Princeton University letterhead, to Eric B. Gutkind on Jan. 3, 1954 concerning Gutkind’s book, Choose Life: The Biblical Call to Revolt.

The letter was first bought by a bidder in London in 2008 for just over $400,000 and has since been stored in a special facility with a controlled environment.