Nowhere will our labor in the Lord be in vain
Charles SpurgeonWe should not expect to see an immediate reward for all the good we do; nor should we confine our efforts to places and people that seem likely to produce a reward for our labors. The Egyptian throws his seed into the waters of the Nile, an act that seems to be a pure waste of the grain. But in due time the flood of the river descends and the rice and other grains sink into the fertile mud, and quickly the harvest is produced. Today we are to do good to the ungrateful and the wicked. We are to teach the indifferent and the stubborn. Improbable waters could cover hopeful ground. Nowhere will our work in the Lord be in vain.
Our job is to throw our bread into the waters; It is up to God to fulfill the promise: "You will find it." He will not allow His promise to fail. His good word that we have spoken will live, be found, and be found by us. It may not happen yet, but one day we will reap what we have sown. We have to exercise our patience; for perhaps the Lord will exercise it. "After many days," says the Scripture, and in many cases those days turn into months and years, and yet the word remains true. God's promise will be fulfilled; we must be concerned about keeping the precept, and keeping it on this day.
Source: The Bank of Faith Checkbook. Translation by Allan Roman.
http://www.spurgeon.com.mx/chequera/meditames/junio.pdf