Once upon a time, in a village in India lived a poor artist who used to make idols of Hindu gods and sell them in the daily marked in the neighbouring village.
In due course, this poor artist had a son. As the son grew up he watched his father make those idols, and he got interested. The son also started making the idols under the guidance of his father. Then one day the father took the son with him to the market with his idols. The idol made by the son sold for Re. 0.25. He was really happy. The artist's own idols sold for Re 2.00 each.
The young son made more idols, and his father pointed out the flaws in them and urged his son to do better. The son did do better and his idols started to sell for more - first 50p, then 75p and then a whole Rupee.
There came a day when the son sold his first idol at Re. 2 alongside his father. He was ecstatic. The father was very proud of his son. But he never stopped criticising his son's work.
Slowly the son's work started to surpass his father's. His idols would sell for Re. 3 while the father's idols still sold for Re.2. 00. He still criticised the son's work every day.
One day the son flared up "My idols sell for more than yours. How come you still criticise my work?"
The father took a deep breath "Son, I also used to be like you, my idols used to tell for 10p and slowly I got to where I could sell them for 2 rupees each. But once I became proud of my work, I never got better than that. I stopped at 2 Rs. and I don't want you to stop like I did."
Moral: There never comes a time when you can stop learning and growing.