Every walk we take offers subjects for profound meditation,—every pebble that attracts our notice, matter for serious reflection; and contemplating the incessant dissolution and renovation which are taking place around us in the organic and inorganic kingdoms of nature, we are struck by the force and beauty of the exclamation of the poet—
"My heart is awed within me, when I think
Of the great miracle which still goes on
In silence round me—the perpetual work
Of Thy Creation, finished, yet renewed
For ever!"

The Medals of Creation or First Lessons in Geology (1854)