It is the same sense of the transience of beauty that inspired the "Ode to a Grecian Urn" on which pastoral beauty was fixed in eternal rapture:—
Ah, happy, happy boughs I that cannot shed
Your leaves, nor ever bid the spring adieu.
And there we touch the paradox of this strange life. We would keep the fleeting beauty of Nature, and yet we would not keep it. The thought of those trees whose leaves are never shed, and of that eternal spring to which we never bid adieu, is pleasant to toy with, but after all we would not have it so. It is no more seriously tenable than the thought that little Johnny there should remain for ever at the age of ten. You may feel that you would like him to remain at the age of ten. Indeed you are a strange parent if you do not look back a little wistfully to the childhood of your children, and wish you could see them as you once saw them. But you would not really have Johnny stick at ten. After five years of the experience you would wish little Johnny dead. For life and its beauty are a living thing, and not a pretty fancy sculptured on a Grecian urn.
And so with the pageant of Nature. If the pageant stopped, the wonder itself would stop. I should have no sudden shock of delight at hearing the first call of the cuckoo in spring or seeing my hawthorn hedge burst into snowy blossoms. I should no longer remark the jolly clatter of the rooks in the February trees which forms the prologue of spring, nor look out for the coming of the first primrose or the arrival of the first swallow. I should cease, it is true, to have the pangs of "Farewell," but I should cease also to have the ecstasy of "Hail." I should have my Grecian urn, but I should have lost the magic of the living world.
By the time I had reached the gate I had buried my regrets for the vanished hawthorn. I knew that to-morrow I should find new miracles in the hedgerows—the wild rose and the honeysuckle, and after them the blackberries, and after these again the bright-hued hips and haws. And though the cuckoo's note should fail him, there would remain the thrush, and after the thrush that constant little fellow in the red waistcoat would keep the song going through the dark winter days.