Such a quote is not a talisman. Focusing on the good coming from irrelevant pursuits is confirmation bias and applying such a quote broadly is a slacker's crutch. Let's look at all the semi-self-serious stoners, punks, drunks, libertarians, etc. contemplating the irrelevant... accomplishments? Only if we want to say "do no harm" is better than what they'd do with a bit more ambition.