Jarrett J. Krosoczka-How a boy became an artist

When Jarrett J. Krosoczka was a kid, he didn’t play sports, but he loved art. He paints the funny and touching story of a little boy who pursued a simple passion: to draw and write stories. With the help of a supporting cast of family and teachers, our protagonist grew up to become the successful creator of beloved children’s book characters, and a vocal advocate for arts education. (Filmed at TEDxHampshireCollege.)

https://www.ted.com/talks/jarrett_j_krosoczka_how_a_boy_became_an_artist Why did the words "nice cat" make such a difference in his life?  Why does he want to say that to the kids in schools that he visits?

Why do you think he became a successful artist?