You must believe in what you're doing, that what you're doing is the proper thing, the right thing. And you must have faith that things will end up as they should, which doesn't mean as you want them to, but things will work out as they should.
Don't give up on your dreams, or your dreams will give up on you.
It isn't what you do, but how you do it.
If you don't have time to do it right, when will you have time to do it over?
Be more concerned with your character than your reputation.
I think the teaching profession contributes more to the future of our society than any other single profession.