Philosophy expert shares the 'simple but profound rule' to tell if someone is a good or bad person
It comes down to a specific type of kindness.

Johann Wolfgang von Goethe and a scene at a restaurant.
Have you ever met somebody new and wondered if they were a good person with a mischievous streak or a bad person who can turn on the charm and behave occasionally? Determining someone’s true moral character is important, especially if you start dating them or have a business relationship. It is crucial to get to the core of who they are and know whether they can be trusted.
Popular TikTok philosopher and Substack writer Juan de Medeiros recently shared a great way to determine whether someone is good or bad. His rubric for judging someone’s moral character comes from a quote commonly attributed to Johann Wolfgang von Goethe, a German poet, playwright, novelist, and intellectual known for works like Faust and The Sorrows of Young Werther.
How can you tell if someone is a good or a bad person?
“Here's a pretty good indicator that somebody is a bad person and vice versa, how you can spot a good one. And this goes back to a simple rule, a moral aphorism by Goethe in which he writes, ‘Never trust someone who is unkind to those who can do nothing for him,’” de Medeiros shared in a TikTok video with over 45,000 views.
“Never trust someone who is unkind to those who can do nothing for him,” Johann Wolfgang von Goethe
@julianphilosophy Good vs. bad #good #bad #wisdom
De Medeiros then provided real-world ways to determine whether the person you have questions about is good or bad. “A bad person is unfriendly to strangers, to the elderly, to children, to service staff, to anybody they're not trying to impress,” he said. At the same time, the good person treats people equally, no matter what they can do for him. They’re good for goodness sake, not to get anything out of it.
“A good person carries grace within them and shares it freely with abundance. A good person treats other people as they would like to be treated as well. And it doesn't matter who you are, it doesn't matter what your status is, they will treat you and see you as their equal,” de Medeiros said.
an instant green flag was when my current bf took me to a restaurant n the waiter brought us our food but had clearly forgotten about his drink and bc he didn't want her to feel bad he went "hey sorry I forgot earlier but could I also have a glass of water with my *drink name*?"
— Redda (@fragoles) April 21, 2022
What is 'The Waiter Rule'?
Goethe’s quote echoes the common red/green flag test that many people have on dates. Sure, it's important if your date is courteous and treats you well on the date, but you really want to watch how they interact with the server. The rule is often called “The Waiter Rule,” outlined by William Swanson. Swanson, the former chairman and CEO of Raytheon Company, wrote in his book, 33 Unwritten Rules of Management, "A person who is nice to you but rude to the waiter—or to others—is not a nice person." Boxer Muhammad Ali is also known for saying something similar: "I don't trust anyone who's nice to me but rude to the waiter. Because they would treat me the same way if I were in that position."
'I don't trust anyone who's nice to me but rude to the waiter. Because they would treat me the same way if I were in that position.'
- Muhammad Ali pic.twitter.com/q1ffLjEBOJ
— The Loneliest Sport (@LoneliestSport) April 5, 2023
Rudeness toward the waitstaff also indicates that the person isn’t very smart. It’s not wise to be rude to someone who is in charge of your meal for the night.
Conversely, a good person is kind to others without looking for anything in return because they want to spread joy and believe that others deserve respect. You are what you do, not what you think or believe, and when someone treats others with goodness, it's a clear indicator of the type of person they are.
In the end, we are all a mixed bag of behaviors and attitudes, and even the most perfect of us has a devil on their shoulder telling them that it’s okay to occasionally get into a bit of mischief. However, when it comes down to determining someone's core character, how they treat those who can do nothing for them says everything.
- A fan called her ugly and fat. Her response made me laugh out loud. ›
- Why simply living as a black man in America is exhausting. ›
- 'Wicked' is becoming a political Rorschach test and so many people are missing the point ›
- Inside the heads of people who are always late, as explained by stick figures. ›
- Dogs can recognize a liar and there’s science to prove it ›