37 1 Do not fret because of evil men or be envious of those who do wrong; 103 for like the grass they will soon wither,like green plants they will soon die away Its commonly taught the metaphors of grass & withering away is teaching the universal problem of the judgment on sin.But the Psalmist connects these phrases with the curse. The saints do not wither away like grass. God cursed the creation with the process of degeneration. But Christ took the curse upon Himself. Christ took the sting our of death.The Psalmist applies the curse by pronouncing the end of the wicked. 103 As for man, his days are like grass, he flourishes like a flower of the field;129 May they be like grass on the roof, which withers before it can grow;The Psalmist complains that he is experiencing pain and sorrow like the wicked. The Psalmist applies the curse on the wicked to push it down under his feet.