Matthew 5:4

Blessed are they that mourn
For sin, for their own sins; the sin of their nature, indwelling sin, which is always working in them, and is a continual grief of mind to them; the unbelief of their hearts, notwithstanding the many instances, declarations, promises, and discoveries of grace made unto them; their daily infirmities, and many sins of life, because they are committed against a God of love, grace, and mercy, grieve the Spirit, and dishonour the Gospel of Christ: who mourn also for the sins of others, for the sins of the world, the profaneness and wickedness that abound in it; and more especially for the sins of professors, by reason of which, the name of God, and ways of Christ, are evil spoken of: who likewise mourn under afflictions, spiritual ones, temptations, desertions, and declensions; temporal ones, their own, which they receive, either more immediately from the hand of God, or from men; such as they endure for the sake of Christ, and the profession of his Gospel; and who sympathize with others in their afflictions. These, how sorrowful and distressed soever they may appear, are blessed

for they shall be comforted:
here in this life, by the God of all comfort, by Christ the comforter; by the Spirit of God, whose work and office it is to comfort; by the Scriptures of truth, which are written for their consolation; by the promises of the Gospel, through which the heirs of promise have strong consolation; by the ordinances of it, which are breasts of consolation; and by the ministers of the word, who have a commission from the Lord to speak comfortably to them; and then are they comforted, when they have the discoveries of the love of God, manifestations of pardoning grace, through the blood of Christ, and enjoy the divine presence: and they shall be comforted hereafter; when freed from all the troubles of this life, they shall be blessed with uninterrupted communion with Father, Son, and Spirit, and with the happy society of angels and glorified saints. ( Isaiah 61:1-3 ) seems to be referred to, both in this, and in the preceding verse.