This part of His purpose culminates in Matthew 5:48. The standard is hopelessly high. We are to live out the perfection of God. It is impossible.
The next purpose is that we have to surrender any notion that we are sufficient to do much of anything, and rather than try to make life work, we are to trust God.
So faced with the crushing, relentless attacks of the enemy. Faced with all of the vagaries of trying to navigate life well, the charge is not to seek our own purposes. No, we are to fully engage in seeking the fulfillment of the first part of the prayer Christ outlines, in Matthew 6:9 – 13a, we are to first, seek His kingdom.
We are to trust God for the rest.
Trust or doubt.
What does God have to do to validate that we can trust Him?