Honest reward for services rendered is commended. Even though such reward is often deserved, it is not always given.
Reward for services rendered
See also
Payment for work done
Favour for help received
Unjust treatment and reward
In a sinful world, good is often unrewarded, or even repaid with evil:
Dishonest reward forbidden
In a fallen world there are many opportunities to gain by wrongdoing.
pp Mk 14:10-11
Rewarding the undeserving
