To be an artist, you don’t have to compose music or paint or be in the movies or write books. It’s just a way of living. It has to do with paying attention, remembering, filtering what you see and answering back, participating in life.

Viggo Mortensen

Source

This quote from Viggo Mortensen appears to have originated from a 2008 Time Magazine article in which the actor responded to questions from fans across the US.