"Psalm 37:1-8 gives positive actions we can take as an antidote to pessimism and discouragement. Consider these mood boosters: Trust in the Lord, do good, dwell in the land, feed on His faithfulness (v.3); delight in the Lord (v.4); commit your way to the Lord, trust in Him (v.5); rest in the Lord, wait patiently for Him, do not fret (v.7); cease from anger, forsake wrath (v.8).
Because they are connected to the phrase “in the Lord,” those directives are more than wishful thinking or unrealistic suggestions. It’s because of Jesus, and in His strength, that they become possible." David C. McCasland