The eureka moment

“It is sometimes just at the moment when we think that everything is lost that the intimation arrives which may save us; one has knocked at all the doors which lead nowhere, and then one stumbles without knowing it on the only door through which one can enter—which one might have sought in vain for a hundred years—and it opens of its own accord.” – Marcel Proust, Time Regained (trans. Moncrieff and Kilmartin)