The pure motive of any man who serves his generation well is generally misrepresented. As a rule the lounger looks on at the laborer not to praise but to blame him: not to cheer him but to chide him. The less he does, the less he will be open to rebuke, and the more he does oftentimes, and the more vigorously, the more he shall be upbraided.
Look not for your reward here. Suppose men praise you, what is their praise worth? It would not fill your nostrils if you were about to die. The approbation of those who have neither skill nor taste — what pleasure can it afford the artist? Should one stoop for it, or, having it, lift his head the higher? Our reward is the approbation of God, which he will give of his abundant grace. He first gives us good works, as one observes, and then rewards us for those good works, as if they were altogether our own. He gives rewards though they are not a debt, but altogether of grace.
Look for the reward hereafter. Wait a bit, man, wait a bit; your reward is not yet. Wait till the week is over, and then shall come the wage. Wait until the sun is gone down, and then there will be the penny for every laborer in the vineyard. Not yet, not yet, not yet. The husbandman waiteth for the precious fruit of the earth. This is what we wait for.
From a sermon by Charles Haddon Spurgeon entitled "A Visit to the Harvest Field