We may never see the end results, but that is the difference between the master builder and the worker. We are workers, not master builders; ministers, not messiahs.
We are prophets of a future not our own.
—Attributed to Archbishop Oscar Arnulfo Romero of El Salvador (1917-1980), possibly original to Bishop Ken Untener
see the full poem text here: http://www.intervarsity.org/slj/article/1354