And source within us; where broods radiance vast,
To be elicited ray by ray, as chance
Shall favor: chance—for hitherto, your sage
Even as he knows not how those beams are born,
As little knows he what unlocks their fount:
And men have oft grown old among their books
To die case-hardened in their ignorance,
Whose careless youth had promised what long years
Of unremitted labor ne'er performed:
While, contrary, it has chanced some idle day,