A limitless ocean.
Not only of knowledge of, but of feeling for, Nature, it is said:
Inscrutable in broadest light,
To be unveiled by force she doth refuse.
But Faust is in deep sympathy with her; witness:
Thou full-orbed moon! Would thou wert gazing now
For the last time upon my troubled brow!
and
Loos'd from their icy fetters, streams and rills
In spring's effusive, quick'ning mildness flow,