I am a part of all that I have met;
Yet all experience is an arch wherethro'
Gleams that untravel'd world, whose margin fades
Forever and forever when I move.
How dull it is to pause, to make an end,
To rust unburnish'd, not to shine in use!
-- Alfred Lord
Tennyson. "
Ulysses" (1833, published 1842).