Works as a wage of debt.

If you seek reward by works as a wage of debt – as if God owes you something because of what you did – you should not expect a reward, but punishment. None of your services is going to meet the qualification. If you present rewards in the guise of rewards for work, it should–and will – produce fear. This is proper and right, because it is according to the system of the Law, and its purpose is to show you your needs.

However, even in the Gospels, especially in Luke, Jesus presents a unique system of salvation, reward, and discipleship, which is of grace. Consider the rich young ruler. Some people believe this was Mark. He said, “what must I do to inherit eternal life?” He was seeking to be justified. Jesus said, “you know the commandments. Do not commit adultery. Do not kill, do not steal. Do not bear false witness. Honor your father and Mother.” To which the young man replied, “All these have I kept since my youth!” The young man was self-deceived. So, Jesus replied, “yet lackest thou one thing: sell all that thou hast, and distribute unto the poor, and thou shalt have treasure in heaven: and come, follow me.” . And the man went away sad, finding that the covetousness in his heart wouldn’t let him. 

"Thou knowest the commandments, Do not commit adultery, Do not kill, Do not steal, Do not bear false witness, Honour thy father and thy mother.

And he said, All these have I kept from my youth up.

Now when Jesus heard these things, he said unto him, Yet lackest thou one thing: sell all that thou hast, and distribute unto the poor, and thou shalt have treasure in heaven: and come, follow me." Luke 18:20-22

And Jesus then told His famous line that it’s easier for a camel to pass through the eye of a needle than for a rich man to enter the Kingdom of heaven. And they, reasonably, asked, who then can enter? And Jesus replied, “with man, it is impossible. But with God, all things are possible” (Mt 10:27).

This is grace.

Grace is God making possible for you what is impossible (if it depends on you).

Read the book Here -> Rewards and Service in Grace