Each of us is a teacher in the broadest sense of the word. We set an example for others by our own life practice. We display for all to see our choice of conduct, attitudes, business ethics, language. We show the measure of our love for God and mankind in the way we speak (or fail to speak) to our family and friends, treat the neighbor's dog, obey the traffic laws; also in the type of reading material and entertainment we select, in how we pay our bills and taxes. Our choices say: "This is important to me. I choose to do this."
And, certainly, each earnest Christian Scientist is a perpetual student, forever learning, and always seeking new spiritual insights, ever deeper meanings, progress in all things.
The student in us strives to learn and to practice what he learns; then the teacher in us has something to share. The lessons are first made our own, for we cannot give what we do not have. The attempt to communicate what we have not demonstrated at least in part is futile. To talk one way and live another is hypocrisy, Phariseeism.