Mat 5:4 Blessed are those who mourn, for they shall be comforted.
The message of this vs is in light of vs 3. The poor in spirit also mourn over the weight of sin he struggles with. Paul dedicates an entire chapter in Rom 7 to address the true causes and reasons of the saints’ grievances and dilemma in this life. The point of this chapter is not his pre-conversion experience but post. With pre-conversion sin would have been pleasurable not a struggle.
His cry under this weight and helplessness, Rom 7:24, “O wretched man that I am! Who will deliver me from this body of death?” (Rom 7:24), And with great sigh of relief, he receives the assurance of the Holy Spirit with which he responds, vs. 25, “I thank God—through Jesus Christ our Lord!...” His deliverance came through Jesus Christ. God calls those who mourn blessed and comforts them in their helpless state both of the present and assurance of the future glory God provides. Psa 51:17 “…; a broken and contrite heart, O God, you will not despise” Sorrow should drive us to look for the heart and the hand of God and so find the comfort in this grief.