I think at your first day of being a teacher you should bring and read this poem to your class or roar at them like a lion like Mr.Henkel did.
And I would not be worried about not having to tell your future students besides the stuff they have to learn.Such worldy wisdoms will come with age,I guess.Or if it really urges you to share some with your students,steal some of our former teacher one's ,mix them and make them your own. :P
Your goal as a teacher could be to be the revenger of the weak,to look out for Dennis G. type of pupils and finish them.(Better do not attend parent-teacher conferences after that though).
Good luck !