To know of, think about—
Is all man’s sum of faculty effects,
When exercised on earth’s least atom.
What was, what is, what may such atoms be?—
Unthinkable, unknowable to man.
Yet, since to think and know fire through and through
Exceeds man, is the warmth of fire unknown?
Its uses—are they so unthinkable?
Pass from such obvious power to powers unseen,
Undreamed of save in their sure consequence: