They also serve who only stand and wait.

Impossible. It's a word that we are all taught to reject. We've all heard the saying "'Impossible' is just an excuse," or something to that effect.

It doesn't always feel that way, does it?

John Milton was a writer who loved to write, and felt that it was his calling. In 1655, his deteriorating eyesight had rendered him functionally blind. Did this mean the end of Milton's writing career?

No. Milton continued to write by dictating his work to assistants, and went on to write his most famous works in this way. But in the beginning, he wasn't at all sure that it was possible for a blind man to be a writer. It was after he overcame this doubt that he wrote the poem "On His Blindness." It's about his struggle with feeling worthless, and the reassurance that God gave him - the assurance that, as long as you are seeking Him, your life cannot be worthless.

When I consider how my life 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?"  *exact = require

I fondly* ask, but Patience, to prevent         *fondly = foolishly

That murmur, soon replies, "God doth not need

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."

Photo by Blythe Whitney: The Bees Knees