Restless activity proves the man!

MEPHISTOPHELES

For you no bound, no term is set.
Whether you everywhere be trying,
Or snatch a rapid bliss in flying,
May it agree with you, what you get!
Only fall to, and show no timid balking.

FAUST

But thou hast heard, 'tis not of joy we're talking.
I take the wildering whirl, enjoyment's keenest pain,
Enamored hate, exhilarant disdain.
My bosom, of its thirst for knowledge sated,
Shall not, henceforth, from any pang be wrested,
And all of life for all mankind created
Shall be within mine inmost being tested:
The highest, lowest forms my soul shall borrow,
Shall heap upon itself their bliss and sorrow,
And thus, my own sole self to all their selves expanded,
I too, at last, shall with them all be stranded!

MEPHISTOPHELES

Believe me, who for many a thousand year
The same tough meat have chewed and tested,
That from the cradle to the bier
No man the ancient leaven has digested!