" While painting The Last Supper, Leonardo would sometimes stare at the work for an hour, finally make one small stroke, and then leave. He told Duke Ludovico that creativity requires time for ideas to marinate and intuitions to gel. “Men of lofty genius sometimes accomplish the most when they work least,” he explained, “for their minds are occupied with their ideas and the perfection of their conceptions, to which they afterwards give form.” Most of us don’t need advice to procrastinate; we do it naturally. But procrastinating like Leonardo requires work: it involves gathering all the possible facts and ideas, and only after that allowing the collection to simmer. "
― Walter Isaacson , Leonardo da Vinci