Just War
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The concept of "Just War" is a doctrine of military ethics that has been discussed and developed throughout Christian history. It seeks to reconcile the necessity of warfare with Christian moral principles. The idea is not explicitly outlined in the Bible, but it has been inferred from various scriptural passages and theological interpretations.

Biblical Foundations

1. Old Testament Context: The Old Testament contains numerous accounts of warfare, often involving the Israelites. God sometimes commands His people to engage in battle, as seen in the conquest of Canaan (Joshua 6). The wars in the Old Testament are often depicted as divine judgments against sin and idolatry. For instance, in 1 Samuel 15:3, God commands Saul to "attack the Amalekites and totally destroy all that belongs to them."

2. New Testament Teachings: The New Testament shifts focus towards peace and reconciliation. Jesus teaches, "Blessed are the peacemakers, for they will be called sons of God" (Matthew 5:9). However, the New Testament does not entirely dismiss the concept of warfare. Romans 13:4 speaks of governing authorities as "God’s servant, an agent of wrath to bring punishment on the wrongdoer," suggesting a role for state-sanctioned force.

Theological Development

The doctrine of Just War was significantly developed by early Christian theologians such as Augustine of Hippo and later by Thomas Aquinas. They sought to establish criteria under which war could be morally justified. These criteria generally fall into two categories: jus ad bellum (the right to go to war) and jus in bello (the right conduct within war).

Jus ad Bellum Criteria

1. Just Cause: War must confront a real and certain danger, such as protecting innocent life or preserving conditions necessary for decent human existence. This aligns with the biblical principle of justice, as seen in Proverbs 21:15, "Justice executed is a joy to the righteous but a terror to evildoers."

2. Legitimate Authority: Only duly constituted public authorities may wage war. Romans 13:1-2 emphasizes submission to governing authorities, which are instituted by God.

3. Right Intention: The intention behind the war must be to promote good or avoid evil. This reflects the biblical call to love one's neighbor (Mark 12:31).

4. Probability of Success: There must be a reasonable chance of success to avoid unnecessary loss of life. This principle is not directly found in Scripture but is inferred from the stewardship of life and resources.

5. Last Resort: All peaceful alternatives must have been exhausted. This is consistent with the biblical emphasis on peace and reconciliation (Matthew 5:9).

Jus in Bello Criteria

1. Discrimination: Combatants must distinguish between combatants and non-combatants. The protection of innocent life is a biblical principle, as seen in Exodus 23:7, "Do not kill the innocent and righteous."

2. Proportionality: The violence used in the war must be proportional to the injury suffered. This reflects the biblical principle of justice and fairness (Leviticus 24:19-20).

Historical and Modern Considerations

Throughout history, the Just War doctrine has been applied to various conflicts, with Christian leaders and thinkers debating its application. In modern times, the doctrine continues to be relevant as nations grapple with issues of war, peace, and justice. The development of international law and organizations like the United Nations reflects an ongoing effort to address these concerns within a global framework.

The Just War doctrine remains a significant topic within Christian ethics, providing a framework for evaluating the morality of warfare in light of biblical teachings and the complexities of the modern world.
Topical Bible Verses
Ecclesiastes 3:8
A time to love, and a time to hate; a time of war, and a time of peace.
Topicalbible.org

1 Timothy 2:1-2
I exhort therefore, that, first of all, supplications, prayers, intercessions, and giving of thanks, be made for all men;
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James 4:1-2
From where come wars and fights among you? come they not hence, even of your lusts that war in your members?
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Romans 13:1-7
Let every soul be subject to the higher powers. For there is no power but of God: the powers that be are ordained of God.
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1 Peter 2:13-14
Submit yourselves to every ordinance of man for the Lord's sake: whether it be to the king, as supreme;
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Matthew 5:9
Blessed are the peacemakers: for they shall be called the children of God.
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John 18:36
Jesus answered, My kingdom is not of this world: if my kingdom were of this world, then would my servants fight, that I should not be delivered to the Jews: but now is my kingdom not from hence.
Topicalbible.org

Isaiah 2:4
And he shall judge among the nations, and shall rebuke many people: and they shall beat their swords into plowshares, and their spears into pruning hooks: nation shall not lift up sword against nation, neither shall they learn war any more.
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Matthew 5:21-22
You have heard that it was said of them of old time, You shall not kill; and whoever shall kill shall be in danger of the judgment:
Topicalbible.org

Exodus 20:13
You shall not kill.
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Library

How, among Innumerable Other Miracles of Healing Wrought by the ...
... beseech the true and living God Almighty in His mercy to defend us from the proud
and cruel enemy; for He knows that we have undertaken a just war for the ...
/.../bede/bedes ecclesiastical history of england/chap ii how among innumerable.htm

How Agreeable all virtues are to God.
... Nabuchodonosor, King of Babylon, had waged a just war against the city of Tyre,
which the divine justice willed to chastise, and God signified to Ezechiel that ...
/.../francis/treatise on the love of god/chapter i how agreeable all.htm

That it is not Lawful for the Well Affected Subjects to Concur in ...
... Suppose then the cause be good and necessary (as no war is just if it be not necessary),
in what case or circumstances shall association with them be unlawful ...
/.../binning/the works of the rev hugh binning/section iv that it is.htm

That Divine Love Makes the virtues Immeasurably More Agreeable to ...
... for his divine Majesty said unto Ezechiel that Nabuchodonosor and his army had laboured
for him, [501] because he had waged a lawful and just war against the ...
/.../francis/treatise on the love of god/chapter ii that divine love.htm

What Cestius did against the Jews; and How, Upon his Besieging ...
... How, Upon His Besieging Jerusalem, He Retreated From The City Without Any Just Occasion
In ... 2. But as for the Jews, when they saw the war approaching to their ...
/.../chapter 19 what cestius did.htm

The Thirty Years' War. AD 1618-1650.
... Mentally, too, the country was full of life; education was carefully promoted, and
just before the war broke out an association was formed, called "The Fruit ...
/.../winkworth/christian singers of germany/chapter viii the thirty years.htm

The Jews Make all Ready for the War; and Simon, the Son of Gioras ...
... Albinus the procurator, that when he wrote these books of the War, he was ... usual custom,
to have reckoned this his barbarous murder as a just punishment upon ...
/.../chapter 22 the jews make.htm

Peace in the Soul
... The world has just passed through a ghastly experience of war at its worst.
Never in history has there been such slaughter, such ...
//christianbookshelf.org/van dyke/what peace means/i peace in the soul.htm

To his Praise!
... the Board, showing that our salary was quite insufficient, with war conditions and
prices, to meet our requirements. The other course was to just go forward ...
/.../goforth/how i know god answers prayer/ix to his praise.htm

"If we Confess Our Sins, He is Faithful and Just to Forgive us Our ...
... and casting ourselves upon his mercy, as the term is used in war, when there is ... goodness,
and be as glorious in passing by an offence, as just in punishing it. ...
/.../binning/the works of the rev hugh binning/sermon xviii if we confess.htm

Resources
How was the flood in the time of Noah just? | GotQuestions.org

How is an eternity in hell a just punishment for only a human lifetime of sin? | GotQuestions.org

What does it mean that the rain falls on the just and the unjust? | GotQuestions.org

Just: Dictionary and Thesaurus | Clyx.com

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