Thunder and light revealed as one same strength—
Modes of the force that works at Nature's heart—
And through the Universe's veinèd length
Bids, wave on wave, mysterious pulses dart.
That cosmic heart-beat it was his to list,
To trace those pulses in their ebb and flow
Towards the fountain-head, where they subsist
In form as yet not given e'en him to know.
Yet, living face to face with these great laws,
Great truths, great myst'ries, all who saw him near