Theory:

     The years went on, and Ernest grew to be a young man. He attracted little notice from the inhabitants of the valley. They saw nothing remarkable in his way of life, except that, when the labour of the day was over, he still loved to gaze upon the Great Stone Face. Their idea was that this was a folly, but pardonable, because Ernest was industrious, kind and neighbourly. They did not know that the Great Stone Face had become a teacher to him, and that the sentiment which was expressed in it would enlarge the young man's heart, and fill it with deeper sympathies than other hearts. They did not know that from this would come a better wisdom than could be learnt from books. Neither did Ernest know that the thoughts which came to him so naturally, in the fields and at the fireside, were of a higher tone than those which all men shared with him. A simple soul — simple as when his mother first told him the old story — he beheld the marvellous face looking down the valley, and still wondered, why its human likeness was so long in coming.
Explanation:
 
Days went by. A few years later, Ernest grew up to be a young man. Earnest's name was established as a good, kind, and hardworking person among his neighbours, but spending time gazing at The Great Stone Face was considered a foolish thing by his neighbours because they did not know the love and sentiment he has towards it. Earnest believed it to be a wonderful teacher who cannot be equivalent to even an actual teacher and his thoughts in regard to the Great Stone Face came from the Valley and not taught by anyone. He still waited for the Great Stone Face’s arrival and wondered why the face bearing its resemblance hadn't arrived as of yet.
 
Meaning of difficult words:
 
S. No.
Words
Meaning
1.
Inhabitants
A person or animal belonging to or resides in a particular place
2.
Remarkable
Any good thing that is big enough to be noticed by others
3.
Folly
A foolish thing that we feel bad about later
4.
Pardonable
Any action that can be forgiven
5.
Industrious
Hard-working
6.
Likeness
Resemblance
Reference:
National Council of Educational Research and Training (2008). Honeydew. The Great Stone Face I -Nathaniel Hawthorne (pp. 120-125). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.