This psalm brings in a little lightheartedness in the face evil. May you find peace to replace your worry. Let’s look at a portion of Psalm 37.

Trust in the Lord, and do good; dwell in the land and befriend faithfulness. Delight yourself in the Lord, and he will give you the desires of your heart. Commit your way to the Lord; trust in him, and he will act. He will bring forth your righteousness as the light, and your justice as the noonday. (verses 3-6, ESV) 

In what do you delight? Have you ever thought of the Lord as a delight? He is ever so willing to give. If your heart is set on Him, there is no need to be concerned.

Be still before the Lord and wait patiently for him; fret not yourself over the one who prospers in his way, over the man who carries out evil devices! Refrain from anger, and forsake wrath! Fret not yourself; it tends only to evil. For the evildoers shall be cut off, but those who wait for the Lord shall inherit the land. (verses 7-9, ESV)

Waiting without worrying. Now that sounds challenging. If we are waiting, we are usually in a hurry, wanting something resolved quickly. This psalm encourages us to rely on the Lord and not get sidetracked by what’s around us. God will handle things in due time. We do not need to attempt to take His place.

In just a little while, the wicked will be no more; though you look carefully at his place, he will not be there. But the meek shall inherit the land and delight themselves in abundant peace. The wicked plots against the righteous and gnashes his teeth at him, but the Lord laughs at the wicked, for he sees that his day is coming. The wicked draw the sword and bend their bows to bring down the poor and needy, to slay those whose way is upright; their sword shall enter their own heart, and their bows shall be broken. (verses 10-15 ESV)

The Lord is not afraid of evil. He knows its limits. It reminds me of watching a small child trying to do something by themselves that clearly they are not able to do. We may chuckle to ourselves at their insistence at being independent and thinking they know enough.