15/08/2018 12:57 AM IST | Updated 06/12/2018 3:33 AM IST

Princess Diana's Thoughtful Habit Is Something Everyone Should Do

And research backs it up.

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Princess Diana was known for an especially thoughtful habit. A recent study shows why you should adopt it, too. 

Princess Diana was known to embrace a habit many people today shrug off, but a recent study shows you might want to reconsider.

In between fulfilling her royal duties as the Princess of Wales, Diana made time to write thank-you letters. In his authorized biography Diana: Her True Story, author Andrew Morton wrote about Diana’s determination to send thank-you cards, noting that after her royal wedding to Prince Charles in 1981 she “sat down to answer many of the 47,000 letters of congratulation and 10,000 gifts which the wedding generated,” with the help of extra staff. 

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Even as a royal, Princess Diana was known to handwrite her thank-you notes.

It turns out Diana understood the significance of a thank-you card much more than others do. According to a recent study, many people underestimate the value of a thank-you letter and how much happiness the recipient will get from it.

As explained by The New York Times in July, Amit Kumar, a professor at the University of Texas at Austin, and Nicholas Epley, a professor at the University of Chicago, had participants write a “gratitude letter” to someone who had an effect on them and gauge how much the recipient would like the letter on a happiness scale. Many of the recipients ranked their happiness as a 4 out of 5, while the senders typically assumed their happiness would only be a 3 on the scale.

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Many of Diana's letters of appreciation have been put up for auction. 

Earlier this month, Princess Eugenie, who married Jack Brooksbank in October, made headlines for reportedly including a handwritten note in her post-wedding thank-you cards, a gesture many royals don’t adopt (likely for the sake of time). 

Diane Gottsman, founder of the Protocol School of Texas and author of Modern Etiquette for a Better Life, noted that what stands out about a thank-you note compared with a text or email is the time that goes into the act. 

“It’s a special touch,” she told HuffPost. “It’s going above and beyond what is generally expected and anticipated because it means that you’ve taken some extra steps.”

If you’re now feeling especially motivated to send a thank-you card to someone for a gift, for a favor or simply for their time, we have a few suggestionsJacqueline Whitmore, etiquette expert and author of the book Poised for Success, told HuffPost in February that you shouldn’t be discouraged if you’re a bit delayed in sending out a note of appreciation.

“A late thank-you note is better than none at all,” she said.

Gottsman recommends using a tone that’s “warm and friendly” along with personal stationery for more of a signature look. 

It won’t be from Kensington Palace, but it will still have an original touch. 

This post has been updated with additional information and new images.