Architects, can you share a personal experience where mentorship played a key role in your professional development?

I have heard, if you really want to understand something, teach it to others. (It is the opposite of "those who can - do, those who cannot - Teach". Teaching a concept to others forces me to get back to the basics. It reinforces those concepts in my own mind. And walking the mentee through the steps, forces me to 'practice what I preach.