The logic of just war, as colonial pastor Jonathan Edwards articulated it, begins at the smallest scale and works outward: if an individual may lawfully use force to defend his own life, then a community, a colony, and a nation may do the same. This argument—simple on its face—carried enormous weight in mid-eighteenth-century New England because it connected the personal right of self-defense to the collective duty of armed resistance against invasion. Edwards’s contribution was not merely philosophical. His sermons moved a generation of colonists from abstract theological agreement to concrete martial commitment, and the framework he built became one of the intellectual pillars beneath the American Revolution.
From Abstract Principle to Frontier Urgency
Edwards’s early work on just war was largely theoretical. British conflicts in Europe were distant, and colonial congregations engaged with the ethics of warfare at a comfortable remove. The eruption of the French and Indian War around 1754 changed everything. With French-allied forces raiding frontier settlements, the question of whether Christians could take up arms ceased to be academic. Edwards’s theology shifted accordingly—not in its conclusions, which had always affirmed the lawfulness of defensive war, but in its tone and application. He began preaching that defensive warfare against foreign invasion was not merely permissible but constituted a positive duty. The citizen who refused to defend his community was not exercising pacifist virtue; he was neglecting an obligation owed to his neighbors, his family, and God.
This duty-based framing resonated powerfully with the Reformed Protestant tradition already dominant in New England. The theology of the right of resistance had been developing for centuries through thinkers like John Knox, Samuel Rutherford, and the authors of the Vindiciae Contra Tyrannos. Edwards stood squarely within this lineage, but he sharpened the argument for a colonial audience facing a specific, immediate threat. Where earlier Reformed writers had focused on resistance to tyrannical rulers, Edwards extended the same logic to resistance against foreign military aggression—broadening the scope of justified force from the political to the geopolitical.
The Duty of Effective Prosecution
One of Edwards’s most striking claims was that a just defensive war must be prosecuted effectively. It was not enough to acknowledge the right of self-defense and then wait passively for the enemy to arrive. A people with a duty to defend themselves also bore the duty to do so competently—to organize, to arm, to train, and to take the field with the intent of actually obtaining the defensive ends that justified the war in the first place. Mere reactive posture was insufficient. Defensive warfare required initiative, preparation, and the willingness to engage the enemy before he reached one’s doorstep.
This principle—that defensive duty implies offensive capability—maps directly onto the citizen-soldier tradition that would define the American militia system. The colonial militia was not a standing army but a body of citizens who understood that effective community defense demanded individual readiness. Edwards’s sermons provided theological fuel for that understanding: the prepared citizen was not a warmonger but a faithful steward of the lives entrusted to his protection. The parallel to the modern argument for armed citizenship is unmistakable. Carrying weapons, maintaining proficiency, and staging gear are not paranoid behaviors—they are the contemporary expression of the same duty Edwards preached.
Influence on Colonial Martial Culture
Edwards’s pulpit theology did not exist in isolation. The Presbyterian and Congregationalist churches of the colonies functioned as institutional amplifiers for just war doctrine. When pastors preached that defense was a duty, their congregations organized accordingly—forming militia companies, drilling, procuring arms and powder. The theological argument lowered the moral barrier to armed action, and the institutional structure of the church provided the social infrastructure to make that action possible.
By the time the colonies faced not a foreign invader but the British Crown itself, the intellectual groundwork was already laid. If a people may defend themselves against a foreign army, may they also defend themselves against their own government when it acts as an aggressor? Edwards’s just war framework, combined with the broader Reformation political theology of lawful resistance to tyranny, provided a clear answer: yes. The leap from defending the frontier against French raids to defending colonial liberties against parliamentary overreach was shorter than it might appear, precisely because Edwards and his contemporaries had already established the underlying principle—that self-defense is not merely a right but an obligation, and that obligation extends from the individual to the community to the nation.
Connection to the Sixth Commandment Tradition
Edwards’s argument about the duty of defense echoes the Reformed reading of the Sixth Commandment that has been central to Protestant political theology since the Reformation. The commandment “Thou shalt not murder” was understood not only as a prohibition against unjust killing but as an affirmative command to preserve life—including one’s own life and the lives of those in one’s care. This reading, explored at length in the context of the Sixth Commandment and the Second Amendment, transforms the ethics of armed defense from a grudging concession into a moral imperative. Edwards’s just war sermons are a direct application of this principle at the communal and national scale.
The broader trajectory traced in The Path of Liberty shows how this line of thinking—from individual self-defense through community militia duty to national armed resistance—forms a continuous thread running from the Reformation through the colonial period and into the founding documents of the American republic. Edwards’s contribution was to make that thread vivid and urgent for colonists who were, within a generation, going to need it.