"The supreme test of technical skill and creative imagination..."

Quote: 

The supreme test of technical skill and creative imagination is the depth of art it requires to render the infinite varieties of the human spirit—which invariably hangs between despair and joy. 

Attribution: 

To Be Young Gifted and Black: Lorraine Hansberry in Her Own Words. Adapted by Robert Nemiroff with an introduction by James Baldwin, p.xvii. NJ: Prentice-Hall, 1969.