Here’s a prayer of invocation based on Matthew 20:1-16, one of the suggested scripture readings for September 18, 2011 (Proper 20A).
Call all the laborers, O God,
Call your laborers who woke early,
Call your laborers who came late,
Call your laborers who feel wronged,
Call your laborers who feel overlooked,
Call your laborers who can't feed their children with this wage,
Call your laborers who know they are working in your fields,
Call your laborers who use their wage to increase your love,
Call all your laborers, O God,
Tell us to roll up our sleeves
For we know that we have work to do.
Let us find you in the work we share here and now,
in Christ's presence we pray. Amen.
— posted on the United Church of Christ webpage.