James 4:9 - Ellicott's Commentary On The Whole Bible

Be afflicted, and mourn, and weep. — For wretchedness, sorrow, and tears are the three steps of the homeward way to peace and God. And in proof of real conversion there must be the outward lamentation, as well as the inward contrition. Grieve, therefore, with a “godly sorrow not to be repented of” (2 Corinthians 7:10) — the remorseful anguish of a Peter, and not a Judas. Let the foolish laughter at sin, which was “as the crackling of thorns” before the avenging fire (Ecclesiastes 7:6), be turned to mourning; banish the joyous smile for the face cast down to heaviness, and so await the blessedness of those that mourn (Matt. v, 4), even the promised comfort of God.