if you ever wait and wonder

CW sui mention. Still working on this.

If you ever wait and wonder why you're living on the earth
If you're thinking that you might as well be dead;
If the darkness ever whispers that your life is lacking worth
And your place should pass to someone else instead:

There waits a task that no-one else is competent to do.
Without your hand it never could be done.
There lives a mind that keeps a place particular for you,
That can't be filled by any other one.

Oblivion may call you— as it must do, by and by,
But contradict the darkness with the truth:
You thought the world won't miss you, but remember that's a lie:
your loss would linger like a missing tooth.