James 5:13–20 closes out the letter by encouraging those who believe in God to show it. This is most readily shown by praying in response to every circumstance. We should pray for ourselves, praise God, and invite the spiritual leaders of our churches to pray for us when we are sick, or spiritually weak. Healing will follow; sins will be forgiven. We should confess sins to each other so we can pray for strength for each other to overcome sin. Prayer works; God hears and responds. If we really believe this is true, our behavior will reflect it.
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“James 5:16” Bibleref.com
16 Confess your offenses to one another, and pray for one another, that you may be healed. The insistent prayer of a righteous person is powerfully effective.