Einstein wrote this in 1922 just as he learned of his Nobel Prize in physics. Either the bellhop refused a tip, or Einstein didn’t have money so he wrote that advice instead. On a second sheet, he wrote another message: “Where there’s a will there’s a way.” Einstein told the bellhop to save the notes — they just might be valuable in the future.
In October 2017, the first fetched about $1.6 million at auction. The second brought a mere $240,000.
Most of us have plenty (by a lot of standards). Not having enough, by itself, isn’t why we choose to be unhappy.
It’s simply having enough and not knowing it.