The object isn't to make art; it's to be in the wonderful state which makes art inevitable.
Verified
creativitySource: The Art Spirit, Robert Henri (compiled by Margery Ryerson), 1923
A well-established line from The Art Spirit (1923), the collection of Henri's teaching notes and letters assembled by his student Margery Ryerson. Usually quoted as 'The object isn't to make art, it's to be in that wonderful state which makes art inevitable.' The submitted text substitutes 'the' for 'that,' a trivial variant. Attribution and source are solid; I hold at 0.85 rather than higher only because I cannot cite the page.