GREEK · LESSON 15
ἔλυσα
First Aorist Active & Middle
The "snapshot" past tense — augment + σα formative + secondary endings. Consonant changes (the Square of Stops), liquid aorists, the aspect distinction, and the aorist as the backbone of NT narrative.
01 / 22
Where we are
The Verb System So Far
- Lessons 10–13 — present system: active, contracts, middle/passive, εἰμί.
- Lesson 14 — imperfect indicative: past ongoing/repeated ("was teaching"). Augment + secondary endings.
- Lesson 15 (this lesson) — first aorist: past snapshot ("taught"). Augment + σα formative + secondary endings.
Same time as imperfect (past). Different aspect (whole event vs ongoing process).
02 / 22
Greek ἀ-όριστος = "un-bounded"
Aorist Aspect — The Snapshot
The aorist views the action as a whole — beginning to end bundled together. It says nothing about how the action unfolds, just that it occurred.
διδάσκει — "he teaches" (present)
Happening now, ongoing.
ἐδίδασκεν — "he was teaching / kept teaching" (impf)
Past, durative — the movie of the action.
ἐδίδαξεν — "he taught" (aorist)
Past, undefined — the snapshot. End of story.
03 / 22
⚠ Gotcha
Aorist Does NOT Mean "Once" or "Instantaneous"
The aorist says nothing about how long the action took.
ἐβασίλευσεν
Can mean "he reigned" (for years) or "he became king" (a moment) — context decides.
Older grammars sometimes call this "punctiliar" or "point-action." This is misleading. An aorist can describe an instant ("he died"), a long process viewed as a whole ("he lived a hundred years"), or anything in between.
The aorist's defining feature is not brevity. It is the speaker's choice to view the action as a whole rather than as a process. Don't build theology on aorist-as-once-for-all.
04 / 22
The visual marker
The First Aorist Signature
Formula: augment + stem + σα + secondary endings.
λύω → ἐ + λυ + σα → ἔλυσα ("I loosed")
When you see a verb starting with ἐ- and containing -σα-, you're almost certainly looking at a first aorist active or middle. The σα is the tense formative — the verb's flag saying "single past event, completed."
05 / 22
The textbook paradigm
λύω — First Aorist Active
| Person | Singular | Plural |
|---|
| 1st | ἔλυσα — I loosed | ἐλύσαμεν — we loosed |
| 2nd | ἔλυσας — you loosed | ἐλύσατε — you (pl) loosed |
| 3rd | ἔλυσε(ν) — he/she/it loosed | ἔλυσαν — they loosed |
Memorize: -σα, -σας, -σε(ν); -σαμεν, -σατε, -σαν.
Note: 3sg uses -σε(ν), not -σα. Movable nu before vowels and at sentence-end.
06 / 22
⚠ The σ is the tell
Imperfect vs First Aorist
Both have augments. Both use secondary endings. The difference: the aorist has σα after the stem.
ἔλυον (impf) vs ἔλυσα (aor)
"I was loosing" vs "I loosed."
ἐπίστευον (impf) vs ἐπίστευσα (aor)
"I was believing" vs "I believed."
ἐδίδασκον (impf) vs ἐδίδαξα (aor)
"I was teaching" vs "I taught." Note σκ + σ contracts to ξ.
07 / 22
Square of Stops
Consonant Changes Before σ
| Stem ends in... | + σ becomes | Example |
|---|
| π, β, φ, πτ (labial) | ψ | βλέπω → ἔβλεψα |
| κ, γ, χ, σσ (velar) | ξ | διδάσκω → ἐδίδαξα |
| τ, δ, θ, ζ (dental) | σ | πείθω → ἔπεισα |
| μ, ν, λ, ρ (liquid) | — (no σ) | μένω → ἔμεινα |
💡 Memorize: labial→ψ, velar→ξ, dental→σ. Same rule appears in 3rd-decl nouns, future, perfect mid/pass, and aorist passive — pays back ten times over.
08 / 22
No σ — but the α is still there
Liquid Aorists
For verbs whose stems end in liquids (λ, μ, ν, ρ), the σ is dropped entirely and the previous vowel typically lengthens.
| Present | Aorist | Meaning |
|---|
| μένω | ἔμεινα | I remained (ε → ει) |
| κρίνω | ἔκρινα | I judged |
| ἀποστέλλω | ἀπέστειλα | I sent |
| ἐγείρω | ἤγειρα | I raised |
The α of the σα formative remains visible. Without σ but with α, you still know it's first aorist.
09 / 22
⚠ Liquid trap
ἔκρινα (aor) vs ἔκρινον (impf)
Both have augment + κριν-. The ending tells you which tense.
ἔκρινα — 1sg ending -α
Aorist 1sg: "I judged." Note the α (of the lost σα).
ἔκρινον — 1sg/3pl ending -ον
Imperfect: "I was judging" or "they were judging" (ambiguous between 1sg and 3pl).
When the σ disappears in a liquid aorist, the α-vs-ο in the ending becomes the only diagnostic. Learn to spot it.
10 / 22
Same σα, middle endings
λύω — First Aorist Middle
| Person | Singular | Plural |
|---|
| 1st | ἐλυσάμην | ἐλυσάμεθα |
| 2nd | ἐλύσω | ἐλύσασθε |
| 3rd | ἐλύσατο | ἐλύσαντο |
Memorize: -σάμην, -σω, -σατο; -σάμεθα, -σασθε, -σαντο.
Translation: "I loosed for myself," etc. The middle highlights the subject's involvement/benefit.
11 / 22
⚠ A new fork in the road
Middle ≠ Passive (Starting Now)
Up through the imperfect, middle and passive shared identical forms. Starting in the aorist, they diverge.
Aorist middle (this lesson)
σα formative + middle endings. ἐλύσατο = "he loosed for himself."
Aorist passive (Lesson 17)
θη formative + active endings. Completely different formation.
So when you see ἐλύσατο, that is aorist middle, not passive. Don't confuse them.
12 / 22
Deponents stay deponent
Deponent Verbs in the Aorist
Verbs that are deponent in the present (middle in form, active in meaning) stay deponent in every tense — including the aorist.
προσεύχομαι → προσηυξάμην
"I prayed." Middle in form, active in meaning. Note the augment infixes (προσ- + ηυξ-) and χ + σ → ξ.
ἀποκρίνομαι → ἀπεκρινάμην (or pseudo-pass ἀπεκρίθη)
"I answered." Common in dialogue: "Jesus answered..."
ἐβαπτίσαντο εἰς τὸν Ἰωάννην
"They got themselves baptized into John" — middle voice highlights the subject's choice. Compare passive ἐβαπτίσθησαν (Lesson 17).
13 / 22
Recognizing first aorist in the wild
Three Diagnostic Cues
- Augment. Like the imperfect — ἐ- before consonants, vowel lengthening for vowel-initial stems.
- σα or just α (in liquid aorists) before the personal ending. The aorist's tell.
- Secondary endings. Active: -, -ς, -, -μεν, -τε, -ν. Middle: -μην, -σο, -το, -μεθα, -σθε, -ντο.
Quick visual: augment + σ + α-vowel + secondary ending. ἔ-λυ-σα, ἐ-πίστευ-σα, ἐ-βάπτι-σα. The σα stands out.
After 50 NT sentences with first aorists, your brain pattern-matches them automatically.
14 / 22
Decoding the disguise
Worked Consonant-Change Examples
ἔγραψα
"I wrote"
ψα → labial stem. φ + σ → ψ. Lexical: γράφω.
ἐκήρυξα
"I preached"
ξα → velar stem. κ + σ → ξ. Lexical: κηρύσσω (κηρυκ-).
ἔπεισα
"I persuaded"
Plain σα where you'd expect a dental. θ + σ → σ (dental drops). Lexical: πείθω.
ἔσπευσα
"I hastened"
δ of σπεύδω dropped before σα.
ἤνοιξα
"I opened"
γ + σ → ξ. Lexical: ἀνοίγω.
15 / 22
Aorist outside the indicative
The Aorist Active Infinitive — λῦσαι
Built on the aorist stem (with σα formative). Ends in -σαι. Two key facts:
- No augment — augments only mark past indicative forms, not infinitives.
- The σα is visible — same σα that marks aorist indicative.
λύειν (pres inf) vs λῦσαι (aor inf)
Both = "to loose." Difference is aspect: pres = "to keep loosing" (durative); aor = "to loose [as a single act]" (snapshot).
Examples: πιστεύω → πιστεῦσαι; ἀκούω → ἀκοῦσαι; γράφω → γράψαι.
16 / 22
Vocabulary — Lesson 15
12 Verbs with First-Aorist Forms
ἀκολουθέω
ἠκολούθησα
I follow (+ dat)
διδάσκω
ἐδίδαξα
I teach (κ+σ→ξ)
ἐγείρω
ἤγειρα
I raise (liquid)
κρίνω
ἔκρινα
I judge (liquid)
πείθω
ἔπεισα
I persuade (θ+σ→σ)
πιστεύω
ἐπίστευσα
I believe
17 / 22
Discourse function
The Aorist Drives the Plot
NT narrative writers (Mark, Matthew, Luke, Acts) use a powerful technique:
- Aorist = main events that move the story forward. Plot beats.
- Imperfect = surrounding context, ongoing scenes, background.
καὶ ἤρχοντο πρὸς αὐτὸν πάντοθεν. καὶ ἐποίησεν δώδεκα...
ἤρχοντο (impf) = "they kept coming" — durative scene-setting.
ἐποίησεν (aor) = "he appointed" — snapshot, plot advances.
When reading, scan the aorists first — they tell you what happened. Imperfects flesh out the scene around the events.
18 / 22
Three aorists, one incarnation
John 1:14
Καὶ ὁ λόγος σὰρξ ἐγένετο καὶ ἐσκήνωσεν ἐν ἡμῖν, καὶ ἐθεασάμεθα τὴν δόξαν αὐτοῦ.
"And the Word became flesh and dwelt among us, and we beheld his glory."
- ἐγένετο — aor mid 3sg of γίνομαι (2nd aor — Lesson 16): "became"
- ἐσκήνωσεν — aor act 3sg of σκηνόω (1st aor with σ): "tabernacled"
- ἐθεασάμεθα — aor mid 1pl of θεάομαι: "we beheld"
All three aorists portray the incarnation as a single, decisive arrival.
19 / 22
Cultural note
The Aorist & the Gospel
The early Christian preaching (kerygma) is aorist-saturated. 1 Corinthians 15:3-5:
Χριστὸς ἀπέθανεν... ἐτάφη... ἐγήγερται... ὤφθη...
"Christ died... was buried... was raised... appeared..." Each verb portrays a historical event as a completed whole. The grammar matches the theology: not ongoing processes or vague generalities — they happened.
The aorist is also the tense of conversion: Paul says ἐπιστεύσατε ("you believed"), ἐβαπτίσθητε ("you were baptized"). Snapshot of the moment a person became a Christian.
Caution: don't over-read. "Aorist" doesn't guarantee "once-for-all." The form portrays events as wholes; whether they recur is context's call.
20 / 22
Vocabulary deep-dives
Five Aorist Forms to Know by Sight
ἔλυσα
"I loosed"
The textbook paradigm. Augment + λυ + σα + ending.
ἐπίστευσα
"I believed"
Often the moment of conversion. Past faith-event grounds present trust.
ἔκλαυσα
"I wept"
From κλαίω. Empty-tomb scene: John 20:11.
ἔπεμψα
"I sent"
Labial change: π + σ → ψ. The Father ἔπεμψεν the Son (Johannine theme).
ἤνοιξα
"I opened"
Velar change: γ + σ → ξ. ἀνοίγω opens heaven, eyes, scriptures.
21 / 22
End of Lesson 15
The Snapshot Past
ἔλυσα · ἐπίστευσα · ἔγραψα
First aorist = past time + perfective (snapshot) aspect. Augment + stem + σα + secondary endings. Consonant changes (labial→ψ, velar→ξ, dental→σ). Liquid aorists drop σ but keep α.
About 70% of NT verbs use the first aorist. The other 30% use second aorist — same aspect, different formation. That's Lesson 16.
Next: Lesson 16 · Second Aorist
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