Apparently, Albert Einstein figured out the key to a happy life back in 1922, and someone just bought it.
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The quest for happiness is basically about looking for something that you can't hold or touch, but can you buy it? One high-paying existentialist apparently believes so.

To understand why someone would buy their ticket to happiness (there's no way it's that simple, right?), you'll need a little background: In 1922, Albert Einstein scribbled down some words on a piece of paper and left them with a bellboy, instead of a tip. "Maybe if you're lucky this will become much more valuable than just a regular tip," the physicist told him while leaving a hotel in Tokyo, according to an auction house.

While some might accuse the Nobel Prize winner of being stingy, he turned out to be right in more ways than one. Written on that piece of paper was Einstein's self-devised theory of happiness. And it just sold yesterday for $1.56 million at an auction in Jerusalem, Israel.

It reads: "A quiet and modest life brings more joy than a pursuit of success bound with constant unrest." And maybe there's something we can all learn from that.

Considering there's a strong link between depression and a slew of other mental and physical health conditions, being happy is the single most important thing you can do for your health. But when it comes to achieving true happiness, there are a ton of misconceptions. A lot of people tend to think that the more you have, the happier you'll be-especially when it comes to money and tangible possessions. (Related: 20 Ways to Get Happy (Almost) Instantly!)

But as the saying goes, "Money can't buy you happiness"-and there's quite a bit of science to back that up. Research generally finds that money can only improve your satisfaction with life until a certain pay grade. On average, that point is $75,000-but it varies from state to state depending on the cost of living. (Related: Is This the Equation for Happiness?)

While going full-on Marie Kondo with your life might not be realistic for you right now (even organizing your beauty products can seem daunting), there is something to be said for streamlining your lifestyle-your closest and your schedule included-and focusing on quality over quantity. After all, one perfectly executed pistol squat is much more valuable than 10 poor-form, half-hearted reps.