A Teacher

We can't strive for goals that are unachievable. On the other hand, "When will will my behaviour reach the levels of our forefathers?" I don't know about you but I'm not getting there.
How do we reconcile both seemingly contradicting feelings?
This was a question inspired by the curriculum of Sinai Scholars last night.
It is interesting because we really see this contradiction by sports and physical training. you can't set your goal too high but on the other hand you can't set it too low either. The answer is a teacher that helps you set realistic goals but pushes you farther than you ever thought you could go.