Clearly the hardest thing for the working artist is to...

Clearly the hardest thing for the working artist is to create his own conception and follow it, unafraid of the strictures it imposes, however rigid these may be... I see it as the clearest evidence of genius when an artist follows his conception, his idea, his principle, so unswervingly that he has this truth of his constantly in his control, never letting go of it even for the sake of his own enjoyment of his work.