Although gravity is by far the weakest force of nature, its insidious and cumulative action serves to determine the ultimate fate not only of individual astronomical objects but of the entire cosmos. The same remorseless attraction that crushes a star operates on a much grander scale on the universe as a whole.
A gardener is never shut out from his garden, wherever he may be. Its comfort never fails. Though the city may close about him, and the grime and soot descend upon him, he can still wander in his garden, does he but close his eyes.