Did you ever loan someone some money, and then you wondered if you would ever get paid back? Do you think that God would be good at paying someone back?
There is some interesting terminology to that effect in Colossians 3. Read it carefully: “And whatever you do, do it heartily, as to the Lord and not to men, knowing that from the Lord you will receive the reward of the inheritance; for you serve the Lord Christ” (3:23-24). The Lord rewards His faithful followers. But then look at the next verse: “But he who does wrong will be repaid for what he has done, and there is no partiality” (3:25).
Those who do “wrong” by the Lord and do “wrong” by their fellowman (pay attention to the context) will be “paid back” (ESV) without partiality. Do you suppose the Lord knows how much trouble we’ve borrowed that needs to be “repaid”? Do you suppose the Lord repays with interest? Let us “fear God” (3:22) and do all “heartily, as to the Lord,” so that we don’t find out how much He repays those who do wrong!