How dull it is to pause, to make an end, 
To rust unburnish’d, not to shine in use! 
As tho’ to breathe were life! Life piled on life 
Were all too little, and of one to me 
Little remains: but every hour is saved 
From that eternal silence, something more, 
A bringer of new things; and vile it were 
For some three suns to store and hoard myself, 
And this gray spirit yearning in desire 
To follow knowledge like a sinking star, 
Beyond the utmost bound of human thought.
ALFRED, LORD TENNYSON