Matthew 5:4 - Clarke's commentary and critical notes on the Bible

Blessed are they that mourn: for they shall be comforted. Blessed are they that mourn - That is, those who, feeling their spiritual poverty, mourn after God, lamenting the iniquity that separated them from the fountain of blessedness. Every one flies from sorrow, and seeks after joy, and yet true joy must necessarily be the fruit of sorrow. The whole need not (do not feel the need of) the physician, but they that are sick do; i.e. they who are sensible of their disease. Only such persons as are deeply convinced of the sinfulness of sin, feel the plague of their own heart, and turn with disgust from all worldly consolations, because of their insufficiency to render them happy, have God's promise of solid comfort. They Shall Be comforted, says Christ, παρακληθησονται, from παρα, near, and καλεω, I call. He will call them to himself, and speak the words of pardon, peace, and life eternal, to their hearts. See this notion of the word expressed fully by our Lord, Matthew 11:28, Come Unto Me all ye who are weary and heavy laden, and I will give you rest.