they that mourn] For their sins, with godly sorrow, 2 Corinthians 7:10. or, that are in a sad condition, by reason of persecution for the profession of the Gospel, v. 11, 12. or any other heavie affliction, being otherwise well-affected: such being pronounced happie, not simply because they mourn; but, albeit they mourn; no matter or occasion of mourning whatsoever, being of force to debar them from being deemed truely happie, as v. 3.
they shall be comforted] In part here, by mitigating or taking away their sorrows, or inward consolation by Gods Spirit: compleatly in heaven, 2 Corinthians 1:4. John 16:20. James 1:12. Revelation 7:17. and Revelation 21:4.