Most people think of mentoring as one-directional. A senior person gives their time, their experience, their advice, and the mentee gets the benefit. The mentor is just the vehicle.

That’s not an accurate way to look at the process. In reality, the mentor changes as much as the mentee does, arguably more, and there are specific reasons why.

1. Teaching something forces you to actually understand it

Psychologists call this the protégé effect. People who prepare to teach a piece of knowledge learn it more deeply than people who prepare to be tested on it, because teaching demands a level of clarity that simply knowing something doesn’t. Makes sense, doesn’t it?

A mentor sits down to walk her mentee through how she handles tricky client negotiations, step by step. Halfway through, she realises step three doesn’t actually follow from step two. It’s just something she’s always done on instinct, and she’s never had to explain it out loud before. So by the time she’s done, she hasn’t just handed off her old approach. She’s actually improved it.

2. It’s leadership practice with no authority to fall back on

Most mentors have zero formal power over their mentee. No sign-off, no line management, nothing to enforce compliance. Whatever gets done, gets done because the mentee chose to act on it.

A mentor notices his mentee keeps skipping stakeholder check-ins before big decisions. He can’t mandate the fix or write someone up for it. So over a few sessions, he learns a different approach: instead of telling the mentee what to do, he shows them what happens downstream if they don’t. He makes the risk visible instead of issuing an instruction.

That skill doesn’t stay in the mentoring room. It’s the same one he leans on later, leading a cross-functional project with no direct reports of his own, where nothing gets done unless people choose to follow him.

3. A mentee’s naive questions expose blind spots you stopped noticing

Mentees ask questions senior people have stopped asking themselves, because they haven’t yet learned which questions are supposed to be off-limits. That’s what mentoring gives you back: fresh eyes on your own field. 

A mentee asks her mentor, completely innocently, why every decision on her team seems to go through her personally. The mentor doesn’t have a good answer. She realises she’s turned herself into the hub, not because the team actually needs that, but because it’s what feels familiar to her. Peers don’t usually ask that kind of question. They’ve learned not to. Mentees haven’t learned that yet, and that’s exactly what makes them useful. 

4. It trains restraint as a practised skill, not a personality trait

The instinct to jump in and fix things is one of the hardest habits for any leader to unlearn, and most people never get structured practice at unlearning it.

A mentor watches his mentee struggle through three failed drafts of a proposal. Every instinct tells him to step in. He doesn’t. It’s uncomfortable, and he sits with it anyway. It doesn’t get any easier the second or third time either, but it’s a different kind of hard than the one waiting for him back at work, when he watches one of his own team members struggle with something similar and chooses, again, not to rescue them.

The upside most organisations miss

When mentoring is left informal and untrained, organisations aren’t just under-serving the mentee. They’re leaving the mentor’s own leadership development on the table too.

None of the four mechanisms above happen automatically. A mentor who was never taught to ask before telling will default to giving advice, and the protégé effect never gets a chance to kick in. A mentor who slides into managing instead of mentoring never has to build influence without authority. Untrained mentoring can quietly skip every one of these benefits while still looking, from the outside, like mentoring is happening.

That’s the real case for raising mentoring standards to an accredited level across an organisation. It’s not just about protecting the mentee’s experience, although that matters plenty. Every mentoring relationship is secretly a leadership development opportunity for the mentor too, and it only pays off if the mentor actually knows how to run it.

Our Professional Mentor Training programme, delivered in partnership with Irish Medtech Skillnet, is built to make that deliberate. It’s an 11-week blended programme, three full-day sessions in person supported by shorter online sessions in between, leading to globally recognised EMCC accreditation. Participants can work toward Foundation or Practitioner level depending on where they are in their mentoring practice, and everyone identifies a real mentee before the programme starts, so the skills get applied from day one rather than left theoretical.

If you’re ready to build stronger leaders through better mentoring, find out more about the programme here.