it's not over yet

When I consider how my light is spent,

   Ere half my days, in this dark world and wide,

   And that one Talent which is death to hide

   Lodged with me useless, though my Soul more bent

To serve therewith my Maker, and present

   My true account, lest he returning chide;

   “Doth God exact day-labour, light denied?”

   I fondly ask. But patience, to prevent

That murmur, soon replies, “God doth not need

   Either man’s work or his own gifts; who best

   Bear his mild yoke, they serve him best. His state

Is Kingly. Thousands at his bidding speed

   And post o’er Land and Ocean without rest:

   They also serve who only stand and wait.”

John Milton.

Composed sometime between 1652 and 1655, John Milton's "Sonnet 19 [When I consider how my light is spent]" grapples with the subject of the poet's blindness later in life, as well as his changing relationship with God.