I was at a meeting of graduate students where three of my interns were presenting their end-of-year projects to their cohort. After the first intern presented her project, I had the opportunity to give comment and speak about being life-long learners. So, whether we are a teacher, or a graduate student, or a parent, or a head of school, we are life-long learners, and it is particularly important as we become adults because we are modeling for our students.
I sat down and the person in front of me, without turning around, handed me a torn piece of paper with a brief quote inscribed (the image above is a scan of that piece of paper). It really says it all!