I didn't expect teaching to do what it did to me. I became a journalist because I wanted to report and write, and the teaching role arrived sideways — a mentorship here, a formal class there, eventually a sustained investment in a few younger writers over years. What I discovered, and what I've since heard echoed from almost every person I know who teaches seriously, is that it reaches back and does something to you. Teaching is not just transmission. It is a mirror with unusual clarity. The mentor identity is one of the most underexamined roles in how adults come to understand themselves. We talk about mentors as sources of wisdom for mentees. We talk far less about what the mentoring relationship does to the mentor's own sense of self, purpose, and knowledge.

Why Explaining Something Forces You to Know It

There is an old pedagogical insight, formalized by the physicist Richard Feynman, that you do not actually understand something until you can explain it simply to someone who doesn't already know it. The knowledge that exists in your head as familiar, automatic, felt — the kind of understanding you have developed through years of practice — is different in character from the knowledge you can articulate clearly to a beginner. When you mentor someone seriously, you are continuously converting the first kind into the second. You are forced to make explicit what had become implicit. You have to answer questions you had forgotten to ask. You have to locate the principles beneath the practices you had been following on intuition. Research from Stanford's Center for Teaching and Learning has documented that individuals in formal teaching and mentoring roles show measurable increases in their own metacognitive capacity — their ability to observe and articulate their own thinking processes — compared to equally expert peers who do not teach. This conversion process is not just pedagogically useful. It is identity-forming. When you have to say out loud, clearly and repeatedly, what you believe and why you do what you do, you discover what you actually believe and why.

The Generative Function

Erik Erikson identified generativity — the concern for establishing and guiding the next generation — as the central developmental task of midlife and beyond. It is his most durable concept, partly because it captures something essential about the human need to contribute beyond the self, to participate in a continuity that outlasts individual existence. Mentoring is one of generativity's purest expressions. You are actively investing in someone who will carry forward what you know and value, modify it, and pass it on in forms you cannot predict. The psychological research on this is consistent across populations. A study from the MacArthur Foundation Research Network on Successful Midlife Development found that adults who reported high generativity — measured partly through mentoring and teaching activities — showed significantly higher levels of psychological wellbeing, life satisfaction, and sense of purpose than age-matched peers with low generativity scores, even after controlling for socioeconomic factors. Mentoring is not a selfless act in the simple sense. It is a profoundly self-constituting one.

A Tangent Worth Following

There is something important in the asymmetry of what passes between mentor and mentee. The official story is that the mentor possesses wisdom and confers it. The experienced reality is more interesting. Mentees ask questions from a perspective that is genuinely different from the mentor's — they have different cultural formation, different professional context, different assumptions about what is obvious and what is puzzling. The best mentoring relationships I have had, and that I've witnessed, involved the mentee regularly disorienting the mentor in productive ways. The question a young journalist asked me about why I structured a particular story the way I did was more illuminating to me than anything I said in response.

The Risk of False Certainty

Mentoring also carries a specific risk: the consolidation of expertise into a fixed identity that stops learning. The mentor who has taught their approach so many times that they have begun to mistake the map for the territory, who cannot entertain the possibility that their framework is partial or dated, has moved from generativity into stagnation. The identity of mentor is not a destination. It requires continuous revision — going back to the beginner's mind, remaining genuinely curious about the questions your mentees bring, updating what you know from who they are becoming. The mentors I most admire are characterized not by certainty but by a specific quality of engaged uncertainty — they know a great deal and they are still interested in what they don't know. Teaching them is a relationship they are still inside, not a role they have finished playing. That quality — the willingness to keep being changed by the people you are trying to help — is what makes the mentor identity one of the richest available to us.