Passage
Blessed they that mourn, for *they* shall be comforted.
Blessed they that mourn, for *they* shall be comforted.
Matthew 5:2 and, having opened his mouth, he taught them, saying,
Matthew 5:3 Blessed [are] the poor in spirit, for *theirs* is the kingdom of the heavens.
Matthew 5:4 Blessed they that mourn, for *they* shall be comforted.
Matthew 5:5 Blessed the meek, for *they* shall inherit the earth.
Matthew 5:6 Blessed they who hunger and thirst after righteousness, for *they* shall be filled.
The verse centers on "blessed", "mourn", "shall", and "comforted". It is saying that the verse draws attention to "blessed" and "mourn", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 3's "Blessed are the poor in spirit for..." into verse 5's "Blessed the meek for they shall inherit...", so "blessed" and "mourn" belong inside that flow. In Matthew context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "blessed" and "mourn" with trust shaped by these words, not by a vague optimism outside the passage.