It is usually best not to assume who will be your greatest teacher.
I have been surprised many times in my career. I have learned the most about leadership from those I had least expected:
a homeless person
I am glad that I was open to the lesson.
Suspending judgment is the ingredient leaders need if they want to continually grow. When we suspend judgment, we can allow for those most unexpected lessons to come our way. Especially from those we least expect.
Who have you learned from?