Julius Kim closes the book of James with an explanation of why we should pray. Kim connects the previous teachings on steadfastness by describing what James meant in his closing statements. Kim explains that what we pray about reveals the priorities of our hearts.
In his letter, James teaches us exactly what we should pray and why, listing four reasons why we should remain steadfast in prayer:
God hears us.
God heals us.
God forgives us.
God fortifies us.
Kim argues that when we pray, we are strengthened; and he calls us to steadfast prayer in the midst of suffering—just like our example, Christ Jesus.
The Gospel Coalition