1) Understand who they are, and what makes them itchThis is just Paul Hudnut's opinion. No facts support this post.
2) Support them to unreasonable lengths
3) Challenge them to demonstrate what they really can be/do
4) Help them surprise themselves.
By the way, this is also good advice for how to love someone.
I hope that I am living up to Paul's thoughts on mentorship since they are very close to my own. Thanks Paul.