How is John changed by his experience ?

John's experience revealed his inner strength and left him sel-assured.

John had resumed his studies with Dr. Bulkeley. All his uncertainty had disappeared, and his steady eye and voice plainly
revealed the core of strength that Kit had always sensed beneath his gentleness. In the days of his captivity, of which he never
spoke, in the waiting for a chance to escape, and in the weary hunted trail down the Connecticut River, John had found his
answers.