Shared ground
Malachi ends with a promised effect and a warning in one sentence. A coming “he” will bring about a deep change described as turning the heart—an inner direction, not just outward behavior—between “fathers” and “children” (Malachi 4:6). The stated purpose is preventative: this turning is meant to avert God’s “coming” in judgment and the striking of the land with curse.
This closing line also fits Malachi’s wider concern for community breakdown. The restoration described is not only private spirituality; it has public, land-level consequences.
Where interpretation differs
Who “he” is. In the immediate context (4:4–6), “he” is the promised preparer connected with the expectation of a figure “like Elijah.” Some read “he” as that Elijah-like messenger. Others read “he” more directly as God’s own action working through the messenger, so the messenger is real but the ultimate agent is God.
What “fathers/children” refers to. Some take the words mainly as literal family reconciliation across generations. Others take them mainly as a broader picture of generational unity within the covenant community (older and younger turning back toward each other in loyalty and shared faithfulness), which would include but not be limited to individual households.
How strong “curse” is. Some understand the threatened result as comprehensive destruction devoted to judgment (language that can imply total removal). Others understand it as a severe, sweeping punishment on the land without necessarily implying absolute annihilation.
Why the disagreement exists
The verse uses compact, image-rich language without spelling out details. “He” lacks a named antecedent within v.6 itself, so readers lean on the surrounding lines about a coming preparer. Likewise, “fathers/children” can be read as either family terms or shorthand for generations. Finally, curse can carry a range from severe ban-like judgment to broader covenant curse language, so interpreters weigh how literal and how total the threat is meant to be.
What this passage clearly contributes
Explicitly, the text links three things: (1) a coming preparer’s work, (2) a deep reorientation of relationships described as hearts turning across generations, and (3) the avoidance of a land-wide divine judgment. Theological inference can go further (e.g., that social repair is a necessary sign of covenant renewal), but the verse itself clearly presents restored communal bonds as central to preparing for God’s decisive visitation rather than a side issue.