In all of my high school English classes, my classmates and I got to mentor kids in elementary school who were having problems with reading. Helping those kids felt like what I was supposed to do with my life. Not only was it fun, but also rewarding because what I was teaching them, they would carry for the rest of their lives. As my high school years progressed I noticed other rewards of teaching. Another reward is that at the same time I am teaching them, they are teaching me right back.
Children have a unique way of making a person see familiar things in a whole new light.