Any human activity that is not purely mechanical (like a simple nervous reflex not involving consciounness) has to do with our soul.
I'm a believer so I'm speaking about soul, for non-believers the sould usually takes other (more specialized and neutral) names like 'mind' 'willingness' and so forth I approve all these names but me (and many other9 summarize with the more global name soul.
Obviously I give for granted that teaching (like reading, writing, kissing, playing, speaking..) is not purely mechanical and thus has to do with soul.
From my personal point of view, when you're happy doing what you do (because you enjoy doing it), then you're doing it from your soul, and you irradiate that feeling, such that anyone can perceive it.
We give cookies ,candies and toys to kids, why we do this ? Because it makes us happy. Teaching is a noble profession, it makes you happy. Generally teachers lives long is my observation. I feel teaching have some relation with soul!!!!!!!!!!,which brings happiness.
Teaching with passion gives more joy . Because we work with young minds. A good teacher is also a good learner and listener. A good teacher also creates a good atmosphere in the class room and brings more joy and knowledge to the students. I feel that the soul feels the joy created by good teaching.
I agree with Simon Raj, and besides, I would add that to be a good teacher you must have a background of generosity because it involves to transmit (free somehow) what one owns. I have eventually met teachers who sometimes appear not to be genuinely interested in their students to learn, as if they were subtly afraid of loosing some power over them. So I think that generosity is a feature of the teacher. I also think that this is a job that has something paternal, because it includes the desire to contribute to the growth of another person, to see him win autonomy and walk by himself. All this has to do with the soul.
The soul of my teaching is educational games. When I teach philosophy of law, I have four mock trials spaced evenly throughout the course of the semester, such that each student in the seminar gets to be either a prosecutor or a defense attorney once in the term. When I teach the history of Christianity, I have a mock "Second Diet of Worms" fictionally held in 1540 where I play Holy Roman Emperor Charles V, and each student plays a different reformer and has to convince me that their religious convictions should be the official position of the Holy Roman Empire. These games cause students to take part in the learning process and to permanently absorb knowledge.