Who decides what is morally right—God or people?
QUESTION:
Who decides what is morally right—God or people (like: Thomas Aquinas)—and why do Christians sometimes disagree about what is moral, especially when reading passages like Judges 11?
ANSWER:
When people ask whether morality is defined by man or by God, they often assume that morality is a universal system that applies the same way in every age, covenant, and dispensation. But Scripture shows something far more precise. God Himself defines what is right, but He does so within the framework of His revealed will for each people and each program. What was moral for Israel under the law is not the same as what governs the Body of Christ under grace. This is why trying to force all morality into one timeless category leads to confusion, disagreement, and contradictions.
The word “moral” simply refers to what is right or wrong according to a standard. The real question is not what the word means, but whose standard applies. Thomas Aquinas and other theologians tried to build universal systems of morality by blending philosophy with Scripture, but the Bible never asks Christians to follow man‑made categories or philosophical ethics. God revealed His will to Israel through the law, and He reveals His will to the Body of Christ through grace. Both come from Him, but they are not the same system, and they are not given to the same people.
This is why two people can look at the same passage—such as Judges 11, where Jephthah makes a rash vow—and come to different moral conclusions. Judges is not a book of moral examples for Christians. It is a record of Israel in a time when “every man did that which was right in his own eyes.” Jephthah’s vow was not commanded by God, approved by God, or presented as a model for anyone. It was simply recorded as part of Israel’s chaotic history. When someone tries to use that passage to define morality for Christians today, they are mixing programs that God kept separate.
For the Body of Christ, morality is not defined by the law of Moses, by philosophical systems, or by Old Testament narratives. Our standard is the life of Christ revealed through Paul’s epistles. We walk in grace, not under the law. We are taught by the Spirit, not by tablets of stone. Our morality flows from our identity in Christ, not from Israel’s covenant obligations. Grace produces truthfulness, purity, kindness, and holiness—not because we fear punishment, but because we belong to the One who saved us.
So when Christians disagree about what is moral, the issue is usually not morality itself but the standard they are using. If someone uses the law, they will reach one conclusion. If someone uses philosophy, they will reach another. But if we stand where God has placed us—in Christ, under grace—then our moral life is shaped by the new man, renewed in knowledge after the image of Him who created us. God defines morality, but He defines it according to the dispensation He has revealed. Israel had the law. We have Christ. And when we walk in Him, the confusion fades and the path becomes clear.


