This past Sunday I preached on Hebrews 11:6 and the great truth that we must not only believe that God is, but we must also believe that he rewards those who seek him. Here is a quote from Calvin where he makes the point that God does not disappoint. Rewards are part of what we strive for as Christians.
The prophet Isaiah would have us to fight against this temptation. [To believe that there is no reward for the righteous.] Even though the whole world should laugh the godly to scorn, and the wicked triumph over them, yet for all that the faithful should not be astonished, but say to themselves, “No, no, the righteous man shall not lose his labor; he shall not be deceived of his expectation when he depends wholly upon the promises of God. (John Calvin, Sermon on Deuteronomy 27:11-15)