When a painting is finished, it's like a new born child, and the artist himself must have time for understanding. How then do you expect an amateur to understand that which the artist dos not yet comprehend.
The artist has to look at life as he did when he was a child. If he loses that faculty, he cannot express himself in an original, that is, a personal way.
The artists must see all things as if he were seeing them for the first time. All his life he must see as he did when he was a child.