A Word-Study Chart · Two Words for One Mercy
iaomai & therapeuō · to heal, to cure · to tend, to care for, to restore
the sudden cure and the patient care — both are God's healing
Two words · one mercy
English flattens both into "heal," but the Greek holds two complementary pictures. ἰάομαι leans toward the decisive cure — often instant, frequently by Jesus' word, and used too for the deeper healing of the soul. θεραπεύω — the root of our word therapy — pictures tending, treating, serving, caring, restoring. The Lord does both: He speaks and a body is made whole in a moment, and He patiently tends the broken over time. Healing is His nature, in the sudden miracle and the long mending alike.
The decisive cure — often instant, by the word; also the healing of the soul (Isa 53:5; 1 Pet 2:24; Matt 8:8). Nouns: ἴασις, ἴαμα.
To serve and restore — the root of "therapy." The most common Gospel word for Jesus healing the crowds (Matt 4:23–24; 12:15). Noun: θεραπεία.
Jesus healed everyone who came; He bore our sicknesses on the cross; He delegated the work to His followers; the early church walked in it; and He left ongoing means for the sick to be healed among His people.
Healing was central to His ministry, not incidental to it.
καὶ ἐθεράπευσεν πᾶσαν νόσον καὶ πᾶσαν μαλακίαν
kai etherapeusen pasan noson
…healing every sickness and every disease among the people … and He healed them.
Wherever He went He healed (therapeuō) — "all who were sick" (8:16). Healing was woven into the gospel of the kingdom He preached. He "went about doing good and healing all who were oppressed" (Acts 10:38); compassion for the body was never a sideline.
The cross that saves the soul also reaches the body.
οὗ τῷ μώλωπι αὐτοῦ ἰάθητε
hou tō mōlōpi autou iathēte
…by whose stripes you were healed.
Peter quotes Isaiah 53:5 — "by His stripes we are healed" (iaomai). The same suffering that bears our sins reaches our sicknesses; Matthew 8:17 ties Jesus' healings directly to "He bore our sicknesses." Healing is not outside the atonement but flows from it — even as its fullness awaits the resurrection.
What He did, He empowered His followers to do in His name.
ἀπέστειλεν αὐτοὺς … ἰᾶσθαι, καὶ θεραπεύειν
apesteilen … iasthai … therapeuein
He sent them to preach the kingdom of God and to heal the sick.
Both words appear together: He gave them power and authority and sent them to heal. "Freely you have received, freely give … heal the sick" (Matt 10:8). The seventy too: "heal the sick … and say, the kingdom of God has come near" (Luke 10:9). And "they will lay hands on the sick, and they will recover" (Mark 16:18).
The mandate did not stop with the Twelve — it spread.
ἄλλῳ δὲ χαρίσματα ἰαμάτων ἐν τῷ αὐτῷ πνεύματι
charismata iamatōn en tō autō pneumati
…to another gifts of healings by the same Spirit.
The Spirit distributes "gifts of healings" to the body (1 Cor 12:9, 28, 30). In Acts the lame man rises in Jesus' name (3:6–8), crowds are healed (5:16), and Philip's city is filled with joy as many are healed (8:7). Healing was the ongoing life of the church, not a closed chapter.
When you are sick, there is a path the church is given to walk.
προσευξάσθωσαν … ἀλείψαντες ἐλαίῳ … εὔχεσθε ὑπὲρ ἀλλήλων ὅπως ἰαθῆτε
… hopōs iathēte
Is anyone among you sick? Let him call for the elders … and let them pray over him, anointing him with oil … and the prayer of faith will save the sick.
A clear, ordinary path: call the elders, anoint with oil, pray in faith. "Confess your sins to one another, and pray for one another, that you may be healed" (iaomai). Healing is not reserved for the spectacular platform; it belongs to the praying community — elders, oil, confession, faith.
There are two ways to mishandle healing. One is the unbelief that expects nothing and so never asks. The other is the hard formula that treats healing as automatic and blames the sufferer when it tarries. Scripture warns against the first — and gently refuses to let us fall into the second.
οὐκ ἐποίησεν ἐκεῖ δυνάμεις πολλὰς διὰ τὴν ἀπιστίαν αὐτῶν
… dia tēn apistian autōn
And He did not do many mighty works there because of their unbelief.
Unbelief really can hinder — a settled refusal to trust Him closes a door. So we ask boldly, expect God to act, and refuse the cynicism that never even prays. Faith reaches out; it does not shrug.
Τρόφιμον δὲ ἀπέλιπον ἐν Μιλήτῳ ἀσθενοῦντα
Trophimon … asthenounta
…but Trophimus I have left in Miletus sick.
Even Paul left a co-worker sick, told Timothy to take wine for his stomach (1 Tim 5:23), and was given grace rather than removal of his own thorn (2 Cor 12:9). So we never tell the suffering that their faith failed. We contend for healing and we refuse to add condemnation to pain.
The same Jesus who healed every disease bore our sicknesses on the cross, handed the work to His followers, and left His church a clear path: pray, anoint, lay on hands, confess, believe. So we pray boldly and expect Him to act — He has not changed, and healing is His delight.
And when healing tarries, we do not turn on the wounded or invent reasons to blame them. We keep praying, we keep loving, and we hold the unanswered with humility — trusting the goodness of the Healer even where we cannot trace His hand. Jas 5:16 — pray for one another, that you may be healed. Contend in faith; never condemn in their pain.
Iaomai tends toward the decisive cure, often instant and by a word, and reaches even to the healing of the soul (Matt 13:15; 1 Pet 2:24). Therapeuō — the root of "therapy" — pictures tending, serving, restoring. God works both ways: the sudden miracle and the patient mending through care, time, and means. Neither cancels the other; both are His.
Healing belongs to the kingdom that is genuinely here — so we pray with real expectancy. Yet its fullness is not yet; the body still awaits resurrection (Rom 8:23). Hold both: pray boldly for healing now, and when it lingers, never tell the sick their faith failed. This is the same pastoral care the study on sōzō urges — faith reaches out, love refuses to wound.
| Word | Greek | Sense & key texts |
|---|---|---|
| iaomai | ἰάομαι | To cure, heal (often instant, by a word; also of the soul) — Isa 53:5; 1 Pet 2:24; Matt 8:8; Jas 5:16. |
| iasis | ἴασις | A healing, a cure — Luke 13:32; Acts 4:22, 30. |
| iama | ἴαμα | A healing (in "gifts of healings") — 1 Cor 12:9, 28, 30. |
| therapeuō | θεραπεύω | To tend, treat, care for, heal — Matt 4:23–24; 10:8; Luke 9:1; Acts 5:16. |
| therapeia | θεραπεία | Care, healing, service (household) — Luke 9:11; Rev 22:2. |