You can tell someone all day about your faith, about what is right and wrong, and about your ethics. It won't carry much weight unless you actually live it out. As you lead and mentor, you have to exemplify what it is you want to see grow in those you're leading. This is true of children, students, mentees, etc. There is no "do as I say, not as I do". The only effective leadership that leads to health is one that models the truth to which their words point.