Acts 18:25

Had been instructed in the way of the Lord

(ην κατηχημενος την οδον του κυριου). Periphrastic past perfect passive of κατηχεω, rare in the old Greek and not in the LXX from κατα and ηχεω (ηχω, sound) as in Luke 1:4, to re-sound, to re-echo, to teach by repeated dinning into the ears as the Arabs do now, to teach orally by word of mouth (and ear). Here the accusative of the thing (the word) is retained in the passive like with διδασκω, to teach (Robertson, Grammar, p. 485). Being fervent in spirit (ζεων τω πνευματ). Boiling (from ζεω, to boil, old and common verb, in N.T. only here and Romans 12:11) like boiling water or yeast. The Latin verb ferveo means to boil or ferment. Locative case after it.Taught carefully

(εδιδασκεν ακριβως). Imperfect active, was teaching or inchoative, began teaching, accurately. He taught accurately what he knew, a fine gift for any preacher.Only the baptism of John

(μονον το βαπτισμα Ιωανου). It was abaptism of repentance

(marked by repentance) as Paul said (Acts 13:24; Acts 19:4), as Peter said (Acts 2:38) and as the Gospels tell (Mark 1:4, etc.). That is to say, Apollos knew only what the Baptist knew when he died, but John had preached the coming of the Messiah, had baptized him, had identified him as the Son of God, had proclaimed the baptism of the Holy Spirit, but had not seen the Cross, the Resurrection of Jesus, nor the great Day of Pentecost.