κύριος

The earliest Christian creed was three words long.

Kyrios Iēsous. Jesus is Lord.

It does not look like much on the page. Three words, and the verb is only implied — Greek does that sort of thing. But in the first century, those three words could cost you everything you had, including your life. The reason they could is that the title belonged to two other people, and the early Christians said it belonged to Jesus instead.

The first was Caesar. Kyrios Kaisar was the Roman emperor’s title in the eastern provinces, and the cult of emperor worship was no joke. By the late first century, refusing to confess Caesar as kyrios — which often meant burning a pinch of incense before an emperor’s image — was a public crime. To say “Jesus is Lord” was to imply that Caesar was not, and Roman governors had ways of finding out who was implying what.

The second was God Himself. When Jewish translators rendered the Hebrew Bible into Greek two centuries before Christ, they reached for kyrios whenever the Hebrew said YHWH — the divine Name, the four-letter Name the rabbis would not even pronounce. Every time a Greek-speaking Jew read the Bible aloud and came to that Name, they said kyrios. By the time the New Testament was written, kyrios and YHWH were the same word in two languages — for Jews, anyway. To say “Jesus is Kyrios” was to say He bore the divine Name.

Three words. Two terrible implications. One creed.

The Word

κύριος (kyrios), pronounced KOO-ree-os. A second-declension masculine noun. The family includes the verb kyrieuō — to rule, to exercise lordship — and the adjective kyriakos, “belonging to the Lord,” which gives us “Lord’s Day” and “Lord’s Supper” in our Bibles.

The word has a wide range. In ordinary first-century Greek, kyrios could mean almost anything from a polite “sir” to a household master to a governing official to a god. Slaves called their owners kyrios. Wives sometimes called their husbands kyrios. Children called their fathers kyrios. It was a word of respect first, of authority second, of divinity third — and which sense was in play depended entirely on who was speaking to whom about what.

What made the word load up theologically was the Septuagint. When the seventy translators rendered the Hebrew Bible into Greek, they had a problem. The divine Name — the tetragrammaton YHWH — appears thousands of times in the Old Testament. The translators chose not to render it as a name at all. They chose a title. Kyrios. From that moment forward, in Greek-speaking Judaism, kyrios with the definite article (ho kyrios, “the Lord”) meant YHWH unless context indicated otherwise. The word kept all its ordinary uses; it also picked up the heaviest possible theological weight. Context governed which one was in play.

This is the background a Greek-speaking first-century Jewish Christian was reading the New Testament against. When Paul calls Jesus kyrios, the word’s whole semantic range comes with it — but the Septuagint reading is the one that matters most.

Range of Meaning

Kyrios in the New Testament covers a wide field:

• Sir, as an honorific address. The polite “sir” of someone you respect but do not yet recognize. Mary at the empty tomb calls the unrecognized Jesus kyrios in John 20:15 — “Sir, if you have carried him away…”
• Master, owner, proprietor. A slave’s address to his owner; the master of a household; the owner of an animal or a piece of property. Jesus’ parables are full of this sense.
• Ruler, governing official. A title for those with authority.
• A god, in pagan usage. Greek gods and goddesses were kyrioi and kyriai to their devotees. Caesar took the title to himself.
• The Lord, meaning YHWH. The Septuagint convention. Quotations of the Old Testament in the New Testament routinely carry this sense.
• The Lord, meaning Jesus. The primary New Testament use, and the one that absorbs and reshapes all the others.

The interpretive question for any given verse is: which sense is the speaker using? When Sarah calls Abraham kyrios in 1 Peter 3:6, it is the marital-respect sense. When the servants in the parable of the talents address their master as kyrios (Matt 25:20), it is the household sense. When Paul writes that there is “one Lord, one faith, one baptism” (Eph 4:5), he means Jesus, and he means it in the fullest sense the word can carry. Context tells you.

Where You’ll Meet It

“Therefore God has highly exalted him and bestowed on him the name that is above every name, so that at the name of Jesus every knee should bow, in heaven and on earth and under the earth, and every tongue confess that Jesus Christ is Lord, to the glory of God the Father.” (Philippians 2:9–11, ESV)

The high-water mark of kyrios in the New Testament. Paul is quoting Isaiah 45:23 — a passage in which YHWH Himself swears, “To me every knee shall bow, every tongue shall swear allegiance.” In Isaiah, the One to whom every knee bows is YHWH; in Philippians, it is Jesus. Paul is not being subtle. He is applying a passage about YHWH to Jesus and asking the reader to draw the obvious conclusion.

“…if you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved.” (Romans 10:9, ESV)

This is as close as the New Testament gets to a definition of Christian conversion: the verbal confession that Jesus is Kyrios, paired with faith in the resurrection. Notice what Paul does not say. He does not say “make Jesus Lord of your life.” He says: confess what is already true. The Lord is the Lord. You either say so or you do not.

“…for ‘everyone who calls on the name of the Lord will be saved.’” (Romans 10:13, ESV)

Four verses later, Paul quotes Joel 2:32 — “everyone who calls on the name of YHWH will be saved” — and applies it to calling on Jesus. The seam is invisible. Paul has been talking about Jesus the whole time. He drops the Joel quotation in as if it has been obvious all along that the kyrios on whose name the saved call is Jesus. For Paul, it is obvious.

“…no one can say ‘Jesus is Lord’ except in the Holy Spirit.” (1 Corinthians 12:3, ESV)

The confession is itself a gift. Saying the three words is not a feat of religious effort; it is the natural speech of someone the Spirit has given new life. Faith is not what you do to make Jesus Lord. Faith is what the Spirit gives you to confess what Jesus already is.

“Not everyone who says to me, ‘Lord, Lord,’ will enter the kingdom of heaven, but the one who does the will of my Father who is in heaven.” (Matthew 7:21, ESV)

The warning verse. Saying the word and meaning the word are not the same. Jesus is warning against the use of the title as a verbal token without the corresponding life. The point is not that the verbal confession does not matter — Romans 10:9 still holds — but that the confession must be a real one. A kyrios who does not rule in any actual sense is not a kyrios at all.