In November 1922 Einstein was traveling from Europe to Japan for a speaking tour when he learned he'd been awarded his field's highest prize: the Nobel Prize in physics.
Instead, Einstein wrote two short notes and handed it to the messenger.
A note written on a Tokyo hotel official paper in 1922 by Albert Einstein is seen before it is sold at an auction in Jerusalem, October 24, 2017.
But the seller of the happiness note said: "I am really happy that there are people out there who are still interested in science and history and timeless deliveries in a world which is developing so fast". Impressed but also embarrassed by the publicity, Einstein tried to write down his thoughts and feelings from his secluded hotel room.
A note handwritten by Albert Einstein in the 1920s, detailing the German-born physicist's simple theory for a happy life, sold in a Jerusalem auction to an anonymous European buyer on Tuesday for $1.56 million.
It just sold for $1.56 million.
Another note Einstein addressed to the porter, which read "where there's a will there's a way", sold for $240,000 (£182,000). According to Winner's auctions, the winning bid for the note far exceeded the pre-auction estimate of between $5,000 and $8,000.
The seller was reportedly the bellboy's nephew, the BBC reported.
A second note, written around the same time, was also auctioned that was finally sold at Dollars 240,000 (Rs 1,55,91,480), according to BBC News.
It is impossible to determine if the notes were a reflection of Einstein's own musings on his growing fame, but this is a stone in the mosaic, Israeli media "Times of Israel" quoted Roni Grosz, the archivist in charge of the world's largest Einstein collection, at Jerusalem's Hebrew University, as saying.
Albert Einstein is best known for his theory of relativity and mass-energy equivalence formula.