Hemingway on F. Scott Fitzgerald's writing talent

Quoted from Ernest Hemingway on Writing, ed. by Larry W. Phillips, p. 106:

[ F. Scott Fitzgerald's ] talent was as natural as the pattern that was made by the dust on a butterfly's wings.  At one time he understood it no more than the butterfly did and he did not know when it was brushed or marred.  Later he became conscious of his damaged wings and of their construction and he learned to think and could not fly any more because the love of flight was gone and he could not remember when it had been effortless.  excerpted from Ernest Hemingway, A Moveable Feast, p. 147.