Philosophy expert shares the 300-year-old rule to tell if someone is a good or bad person
It was true then, and it's even more true now.

Johann Wolfgang von Goethe and a scene at a restaurant.
What makes a 'good person' is hard to quantify, but sometimes, you just know it when you see it. But that's the problem, you can't always see it. 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.
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."
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.
This article originally appeared in April. It has been updated.



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An Irish woman went to the doctor for a routine eye exam. She left with bright neon green eyes.
It's not easy seeing green.
Did she get superpowers?
Going to the eye doctor can be a hassle and a pain. It's not just the routine issues and inconveniences that come along when making a doctor appointment, but sometimes the various devices being used to check your eyes' health feel invasive and uncomfortable. But at least at the end of the appointment, most of us don't look like we're turning into The Incredible Hulk. That wasn't the case for one Irish woman.
Photographer Margerita B. Wargola was just going in for a routine eye exam at the hospital but ended up leaving with her eyes a shocking, bright neon green.
At the doctor's office, the nurse practitioner was prepping Wargola for a test with a machine that Wargola had experienced before. Before the test started, Wargola presumed the nurse had dropped some saline into her eyes, as they were feeling dry. After she blinked, everything went yellow.
Wargola and the nurse initially panicked. Neither knew what was going on as Wargola suddenly had yellow vision and radioactive-looking green eyes. After the initial shock, both realized the issue: the nurse forgot to ask Wargola to remove her contact lenses before putting contrast drops in her eyes for the exam. Wargola and the nurse quickly removed the lenses from her eyes and washed them thoroughly with saline. Fortunately, Wargola's eyes were unharmed. Unfortunately, her contacts were permanently stained and she didn't bring a spare pair.
- YouTube youtube.com
Since she has poor vision, Wargola was forced to drive herself home after the eye exam wearing the neon-green contact lenses that make her look like a member of the Green Lantern Corps. She couldn't help but laugh at her predicament and recorded a video explaining it all on social media. Since then, her video has sparked a couple Reddit threads and collected a bunch of comments on Instagram:
“But the REAL question is: do you now have X-Ray vision?”
“You can just say you're a superhero.”
“I would make a few stops on the way home just to freak some people out!”
“I would have lived it up! Grab a coffee, do grocery shopping, walk around a shopping center.”
“This one would pair well with that girl who ate something with turmeric with her invisalign on and walked around Paris smiling at people with seemingly BRIGHT YELLOW TEETH.”
“I would save those for fancy special occasions! WOW!”
“Every time I'd stop I'd turn slowly and stare at the person in the car next to me.”
“Keep them. Tell people what to do. They’ll do your bidding.”
In a follow-up Instagram video, Wargola showed her followers that she was safe at home with normal eyes, showing that the damaged contact lenses were so stained that they turned the saline solution in her contacts case into a bright Gatorade yellow. She wasn't mad at the nurse and, in fact, plans on keeping the lenses to wear on St. Patrick's Day or some other special occasion.
While no harm was done and a good laugh was had, it's still best for doctors, nurses, and patients alike to double-check and ask or tell if contact lenses are being worn before each eye test. If not, there might be more than ultra-green eyes to worry about.