So I’ll confess – I’m kind of addicted to Doctor Radio on Sirius XM. The satellite radio show from the NYU medical center features programs dedicated to different medical specialties, with opportunities for calling in and talking to medical experts. But there are two programs that I don’t listen to – the plastic surgery show, and often the dermatology show – because they make me start obsessing too much about my appearance.

Recently, however, I did listen to a dermatology program because the topic was about beauty and our perception of it. One of the guests had done research using before and after photos of facial rejuvenation patients, to see if people rated the faces differently on a list of perceived personality traits. Basically, the question was, what do others think your face says about you? That discussion led to talk of other research showing that people who exhibit positive traits, such as honesty and helpfulness, are perceived as better looking. People who are smiling are perceived as more attractive than people who have neutral expressions.

It’s not news that our expressions and behaviors affect people’s perceptions and judgments. But have you thought about them as what makes you beautiful to someone else? One of the themes of the show was about investment in beauty, not by having plastic surgery or buying cosmetics, but by thinking about what’s shining out of us. Do you smile? Are you kind? Do you look people in the eye? Are you healthy and rested and compassionate?

After listening to the program, I started thinking about some of the truly beautiful people I know, and what makes them beautiful. There’s my sister-in-law, who is unfailingly encouraging and hopeful, with a wonderful, infectious laugh. There’s the friend I met at yoga class a few years ago, who chatted with and befriended literally every person who walked through the doors of the yoga studio. There’s my son’s childhood friend, who never wavered from being kind, even in adolescence when most kids are jerks at least some of the time. There’s my sister’s husband, who will help anyone with anything, at any time; whenever he comes to visit, he fixes something in my house or brings me something he thinks I need. There’s my painter, who had a casual conversation with my neighbor months ago about something that wasn’t working in her apartment; last week, when he came back, he brought her something to fix it.

These are just a few examples of people who are beautiful because of the positive traits they exhibit on a daily basis: kindness, friendliness, helpfulness, integrity and honesty.

A few weeks ago, I met a woman while I was working who was very beautiful, physically. She had lovely skin, beautiful hair and stylish clothes; I couldn’t help admiring her. But then I heard her ask a co-worker to do something that clearly wasn’t the co-worker’s job. The “beautiful” woman was exercising the power she had due to her position in the office hierarchy. My admiration for her was immediately diminished because of her behavior.

My dictionary defines beauty as “The quality that gives pleasure to the mind or senses and is associated with such properties as harmony of form or color, excellence of artistry, truthfulness, and originality.” While people who possess physical beauty may give pleasure to the senses, the people I know with true beauty give pleasure to my mind. They have a harmony of spirit, and values, that transcends anything on the exterior. People often talk of inner beauty, but I would argue that it can’t exist alone; anyone with inner beauty has a beautiful outer light that shines on everyone they meet.