Psalm 37 makes us understand that we must not only do good to everyone, including our enemies.
The Lord always took good care of the psalmist David, giving him words of encouragement so that he understood that he was not alone.
That is why in Psalm 37 reads:
1 Fret not thyself because of evildoers, neither be thou envious against the workers of iniquity.
2 For they shall soon be cut down like the grass, and wither as the green herb.
3 Trust in the Lord, and do good; so shalt thou dwell in the land, and verily thou shalt be fed.
4 Delight thyself also in the Lord: and he shall give thee the desires of thine heart.
Psalm 37:1-3 (KJV)
“Fret not thyself because of evildoers” means that you shall not despair that you have not achieved anything when the bad guys seem to get everything easy. These types of people will already have their payment for their actions, you find that in verse 2.
That is why we must trust God. In verse three of Psalm 37 there is a promise for those who do good, a promise that the wicked can never enjoy, that is why we must stay on the path of truth.
Although the psalmist made some mistakes, he was a man who repented, because he went before the presence of God and humbled himself, his heart ached for making a mistake before God.
Finally, in verse four we find the key for God to grant us our requests and it is to delight ourselves in Him. So, let’s not be impatient, let’s trust the Lord so that our ways are cleansed and we receive His great promises.