From positive counsels the apostle turns to prohibitions and commands them not to revile, but to bless. That is, they are to speak only good of people. “Bless those who curse you” (Mt 5:44; Lk 6:28), says Jesus Christ.
Yet the apostle also cites the word of the Psalmist, showing that evil speech disorders the whole of life. It destroys peace and sows evil (see Ps 33:13-17). Therefore, in the words of the Psalmist, he commands us to flee from evil and pursue peace (cf. Eph 2:14-15).
Only those who avoid evil in word and deed, and who pursue peace, are granted happiness in life. For they always live under the protection of God. His face and His ears are turned toward them.
The Lord also looks upon sinners, but not in this way. He looks wrathfully, to pronounce punishment and destruction upon them (cf. Ps 33 and Ps 2:12).