(Fox News) 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, just four years after it fetched $404,000 at auction.

The so-called “God letter,” which the brilliant physicist wrote in German a year before his death in 1955, includes his thoughts on religion, God and tribalism. Einstein wrote the letter on Princeton University letterhead to philosopher Erik Gutkind after he read Gutkind’s book “Choose Life: The Biblical Call to Revolt.”

“… The word God is for me nothing more than the expression and product of human weaknesses, the Bible a collection of honorable, but still primitive legends which are nevertheless pretty childish. No interpretation, no matter how subtle, can (for me) change this,” wrote Einstein, who won the Nobel Prize in Physics in 1921.

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