See the God-given faith of Jonathan; See Jonathan choosing the eternal kingdom over the present kingdom; See Jonathan following the coming kingdom while living the role God gave him
James teaches us the incredible power and danger of our tongues. Our tongues reveal our hearts, which need changing by the the grace of God so that we might bless God and not destroy others.
James teaches us to not show partiality in how we treat fellow Christians. If we show partiality we reject the normal way that God works and we confuse the witness of God's mercy to the world.
James teaches us that the Christian should not speak with anger. While the task of avoiding anger will take work, it will provide life. He goes further to call us to love others, the essence of true religion.
When trials bring temptations, we should understand that though the trial may be brought by God our temptation derives from our sinful hearts. Our temptation can only be resolved by faith birthed by God focused on His goodness.
James opens his letter by reminding us of our primary calling as servants of Jesus, living with other Christians as pilgrims who draw near to Jesus through His Word.