Daily Devotional for Sunday, June 08, 2025

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How Then Could I Do This Great Evil? A Devotional on Genesis 39:9

Faithfulness to God Requires Moral Clarity in Every Situation

“There is no one greater in this house than I, and he has not withheld anything from me except you, because you are his wife. So how could I commit this great evil and actually sin against God?” — Genesis 39:9

This declaration by Joseph stands as one of the clearest demonstrations of moral integrity in all of Scripture. It is not just a statement of self-restraint, but a declaration of conviction rooted in loyalty to God. Spoken while he was a slave in Egypt under the authority of Potiphar, Joseph’s words come in direct response to repeated sexual advances by Potiphar’s wife. Her pursuit was aggressive, persistent, and private—yet Joseph, though young and far from his homeland, stood firm.

The context of Genesis 39 places Joseph in a moment of vulnerability. He had been sold into slavery by his brothers, betrayed by his family, and removed from the spiritual and moral support of his father’s household. In such a moment, many would have justified compromise. Yet Joseph’s reasoning reveals his unshakable fear of Jehovah, and his firm understanding of moral boundaries.

“There is no one greater in this house than I…”

Joseph begins by acknowledging the trust and authority given to him by Potiphar. As steward over his master’s house, Joseph was in charge of all the possessions and personnel. Genesis 39:4–6 describes how Potiphar had entrusted everything under his care, and the Lord caused Joseph to prosper in all he did.

This statement is not one of arrogance but of rational clarity. Joseph understood his position. He knew the weight of the responsibility he carried. He also recognized the loyalty owed to the man who had trusted him. This is a foundational element of moral reasoning—loyalty, responsibility, and boundaries matter. When a person understands what has been entrusted to them, they are less likely to throw it away for momentary pleasure.

“And he has not withheld anything from me except you…”

This phrase reinforces the exclusive boundary of marriage. Potiphar had placed everything in Joseph’s care—except his wife, which, as Joseph notes, is right and expected. This single line affirms what Scripture consistently teaches: marriage is exclusive, and adultery is a violation not only of human trust but of divine law.

This reinforces that the seventh commandment, “You shall not commit adultery” (Exodus 20:14), was no new invention. Even before the Mosaic Law, God’s moral standard was known and recognized. Joseph’s understanding of marital fidelity shows that God’s commands regarding sexual purity were already binding in principle.

Joseph’s reasoning is based on clear recognition of relational roles: Potiphar is his master, Potiphar’s wife is not his to touch, and any violation of that would be betrayal. Modern attempts to redefine sexuality, erase moral boundaries, or justify immoral conduct under emotional or situational arguments are refuted by Joseph’s example. He did not ask how close he could get to the line. He respected the boundary with clarity and finality.

“Because you are his wife.”

This clause leaves no ambiguity. Joseph identifies the woman’s role and relationship—she is the wife of another man. This eliminates any notion that mutual consent could justify the act. Consent does not override sin. Adultery is evil, even if both parties agree, because it violates God’s created order and defies the sanctity of the marital covenant.

Joseph sees clearly what many fail to grasp: when God establishes roles and relationships, those boundaries are to be respected regardless of circumstances. She was married—therefore, unavailable. There was no scenario in which this pursuit could be justified.

“So how could I commit this great evil…”

Joseph’s rhetorical question reveals the seriousness with which he viewed sin. He did not describe the temptation in casual or softened terms. He called it what it was: “this great evil.” The Hebrew word for evil here is רָעָה (ra‘ah), meaning wickedness, harm, moral corruption.

This is vital. Joseph did not reinterpret the situation in light of his feelings, loneliness, or circumstances. He labeled sin as sin, recognizing that adultery was not just inappropriate—it was great evil. Many today compromise because they downgrade the seriousness of sin. Joseph elevated its gravity.

His words also show proactive moral reasoning. He doesn’t say, “I’ll resist if she presses.” He establishes the boundary in his mind before the act could occur. He judged the situation based on principle, not passion.

“…and actually sin against God?”

This final clause reveals Joseph’s deepest conviction. The true violation, though it would affect Potiphar, was ultimately against God. Sin is not defined primarily by its human consequences, but by its rebellion against the Creator.

Joseph recognized that Jehovah sees everything, even in a foreign land, even in private, even under duress. His fear of God was active, not hypothetical. Though far from home, Joseph lived as if God was present, because He is.

This mirrors the later statement of David in Psalm 51:4: “Against you, you only, have I sinned and done what is evil in your sight.” Though David sinned against others, he rightly acknowledged the ultimate offense was against God.

For Joseph, avoiding sin was not merely about reputation—it was about faithfulness to God’s moral expectations. He did not consider what he could get away with; he considered what would honor God.

Application: What Joseph Teaches About Moral Strength

Know your boundaries before temptation arises
Joseph’s reasoning was formed before the moment of crisis. Know what is right, and fix it in your heart beforehand.
Fear of God keeps you from sin, even when no one is watching
Joseph resisted not because of accountability to men, but because of reverence for God. This is genuine integrity.
Sin must be called what it is: great evil
Never minimize, excuse, or relabel sin. Treat it with the seriousness God assigns to it.
Consent does not justify sin when God forbids the act
Adultery, though mutual, is never acceptable. God’s law—not human agreement—defines morality.
Obedience often costs something—but it is worth it
Joseph’s refusal eventually led to his imprisonment (Genesis 39:20), but it also preserved his conscience, pleased God, and led to future blessing.

Conclusion: Stand Against Sin with Fear and Faith

Genesis 39:9 reveals how a righteous man thinks, even in private moments of great temptation. Joseph’s moral clarity came from a settled fear of Jehovah and a firm conviction that sin was to be resisted without compromise. Though young, alone, and vulnerable, Joseph did not fall. He remembered the trust of man, the boundary of marriage, the nature of evil, and most importantly—the presence of God.

This is the kind of man God honors. And this is the kind of integrity that God’s people must seek today.

“So how could I commit this great evil and actually sin against God?”

Let that question echo in your conscience, sharpen your resolve, and shape your decisions.

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About the Author

EDWARD D. ANDREWS (AS in Criminal Justice, BS in Religion, MA in Biblical Studies, and MDiv in Theology) is CEO and President of Christian Publishing House. He has authored over 220+ books. In addition, Andrews is the Chief Translator of the Updated American Standard Version (UASV).