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Jesus said to his disciples: “You have heard that it was said to your ancestors, Do not take a false oath, but make good to the Lord all that you vow. But I say to you, do not swear at all… Let your ‘Yes’ mean ‘Yes,’ and your ‘No’ mean ‘No.’ Anything more is from the Evil One.” Matthew 5:33–34, 37

When someone’s honesty is questioned, it is not uncommon to respond emphatically by saying, “I swear to God!” This instinct to invoke God’s name is an attempt to lend credibility to one’s words. Such a practice finds its roots in several Old Testament teachings, where the people of Israel were instructed not to profane God’s name by swearing falsely (cf. Exodus 20:7; Leviticus 19:12).

The Old Testament teaching on oaths was not only a prohibition against profaning God’s name but also a way of promoting trust and honesty among the Israelites: “When a man makes a vow to the LORD or binds himself under oath to a pledge, he shall not violate his word, but must fulfill exactly the promise he has uttered” (Numbers 30:3).

Over time, however, the practice of swearing oaths began to shift. Instead of invoking God’s name directly, people began to swear by created things, such as Heaven, Earth, Jerusalem, or even their own bodies or families. Jesus directly addresses these practices in today’s Gospel. This shift often served as a way to avoid fully binding oneself to the truth and to avoid directly profaning God’s name. By swearing upon lesser created things, oaths became tools of deception and manipulation, distorting their original purpose of truth-telling and reverence for God.

In today’s Gospel, Jesus responds to this misuse of oaths by elevating the moral principle behind them—Truthfulness—to a higher standard. He applies this teaching universally to all people and circumstances, calling His disciples to live with such profound integrity that their simple word is sufficient. Truthfulness must flow from a heart that is honest and upright, where a “Yes” means “Yes” and a “No” means “No,” without the need for sworn assurances. In doing so, Jesus invites His followers to a radical interior transformation. Their speech should be a natural expression of their union with God, who is, Himself, the fullness of Truth.

This teaching aligns seamlessly with the other moral commandments Jesus offers in His Sermon on the Mount. One by one, He addresses elements of the Old Testament Law and reveals His mission to fulfill them. Rather than focusing solely on external observance, Jesus deepens the moral requirements of the Law, shifting the emphasis to the interior disposition of the heart. This teaching transcends the Pharisaical approach to the Law, which often reduced righteousness to external conformity. By grace, God now writes these laws on the hearts of His disciples, transforming their moral lives from one of outward compliance to one of sincere interior and exterior holiness.

In the case of oaths, Jesus shows that true discipleship requires not just avoiding falsehood, but cultivating a radical honesty that mirrors the purity of God Who is Truth. This level of integrity is not achieved by human effort alone but through the transformative work of grace, which reshapes our hearts and enables us to live as credible witnesses to the Gospel in both word and deed.

Reflect today on whether or not your ‘Yes’ means ‘Yes,’ and your ‘No’ means ‘No.’ Are you a person of radical honesty and integrity? Do you know the Truth, believe it, and profess it wholeheartedly? While external oaths still hold an important place in sacred moments—such as marriage vows and other Sacraments—they are not meant for casual use in daily life. Instead, strive to be a person of integrity in all your words and actions, ensuring that honesty flows naturally from your heart. By doing so, you allow God’s New Covenant to be written on your heart, transforming your life and enabling you to live as a true disciple of Christ in every circumstance.

Lord of Truth, dwell within my heart and make it pure and holy. Fill me with Your presence so that my words and deeds may always reflect Your light and truth. Help me to be a beacon of honesty and integrity, bringing glory to Your name in all that I say and do. Conform my will to Yours, and guide me to live in accord with Your divine plan. Jesus, I trust in You.

Image: Jesus´ sermon on the mount, graphic collage from engraving of Nazareene School

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