learning obedience

"How could Jesus, who was from the first perfect in obedience--never disobedient--how could he 'learn obedience'? He, too, like his brethren, had to build and strengthen the mental character of joyful enlightened obedience and faithfulness to Divine principles of conduct under great trial. He never failed, never disobeyed, but still he, too, grew in grace and knowledge and spiritual strength and stature."