1 Thessalonians 5:16

Rejoice evermore. Literally, “always rejoice,” with emphasis in the Greek on the idea “always.” Paul placed value on the ability to be happy (see on Phil. 3:1; 4:4; cf. 2 Cor. 6:10). Whether from possession of present good or anticipation of future happiness, the Christian has abundant reason for rejoicing. With forgiveness of his sins his conscience is free, and peace fills his soul. He knows that “all things work together for good” to him (see Rom. 8:28). Why should he ever be downcast? Those who are constantly complaining do not have genuine religion (MH 251).