When Venters carries Bess up the pass to the hidden valley, he experiences a new strength. What is this strength? What is the source of Venters strength?

When Venters carries Bess up the pass to Surprise Valley he experiences new strength because he is Bess' protector. He wants to care for her and make her well and this gives him something to live for, a reason to be a man instead of a boy. The source of his strength is his love for another human being, caring for someone else more than he cares for himself.