And now, the precious note is being sold at an auction house in Jerusalem, for Dollars 1.56 million (Rs 10,13,38,380).
A Japanese courier arrived at the Imperial Hotel in Tokyo to deliver the scientist a message but he had no change to give as a tip.
According to the CEO of Winner's Auctions and Exhibitions, Einstein assumed that the note would someday be worth more than a regular tip.
The auction began at $2,000 and a series of bids pushed the price up rapidly until two final bidders competed by phone to own the historic piece.
In June, letters written by Einstein about God, Israel and physics sold for almost $210,000 at a Jerusalem auction.
The second note, which read "where there's a will there's a way", sold for $240,000, far above it's estimated value of between $4,000 and $6,000.
The $1.5m sale shocked everyone involved in the sale given that its pre-auction estimate was between $5,000 and $8,000 with the buyer, believed to be European, deciding to remain anonymous.
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The seller of the notes was reported to be the messenger's kin.
It was during this tour that the German-born physicist penned a certain note, defining happiness.
Einstein suggested in the note that achieving a long-dreamt goal did not necessarily guarantee happiness.
Roni Grosz, the archivist in charge of the world's largest Einstein collection at Jerusalem's Hebrew University, said the notes shed light on the private thoughts of the great physicist, whose name has become synonymous with genius.
"What we're doing here is painting the portrait of Einstein - the man, the scientist, his effect on the world - through his writings", Grosz said. He willed his personal archives, as well as the rights to his works, to the institution.
Einstein won a Nobel Prize in physics for his theory of relativity.
Perhaps Einstein would have settled for something more "calm and modest".
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