Rewarding hard-working people means encouraging and supporting each other, and there will be corresponding gains and rewards for their efforts.
Heaven rewards diligence and hangs it at home. The bookcase in the study is often the source of knowledge for family members. If someone is struggling for their studies, it is best to hang it on the wall next to or above the bookshelf, indicating that their efforts will be successful.
Interpretation of heaven rewards diligence:
Heaven: justice; Reward: return; Diligence: Diligence. It means that you will get something if you pay. God will reward everyone according to their efforts.