and were taught in Him
The phrase "were taught" comes from the Greek "διδάσκω" (didasko), which means to instruct or impart knowledge. This teaching is not merely academic but transformative, as it is "in Him," referring to Christ. The preposition "in" (Greek "ἐν") signifies a deep, personal relationship and union with Christ. Historically, this reflects the early Christian practice of catechesis, where new believers were systematically taught the doctrines of the faith. This teaching is rooted in the life and example of Jesus, emphasizing discipleship and spiritual growth.

in keeping with the truth
The word "truth" in Greek is "ἀλήθεια" (aletheia), which denotes reality, certainty, and faithfulness. In a world filled with deception and falsehood, the truth of the Gospel stands as an unchanging foundation. This phrase highlights the alignment of the believers' teaching with the truth of Christ, contrasting with the deceitful teachings that Paul warns against in the surrounding verses. The truth is not just a set of doctrines but is embodied in the person of Jesus Christ, who declared Himself to be "the way, the truth, and the life" (John 14:6).

that is in Jesus
The phrase "in Jesus" emphasizes the centrality of Christ in the believer's life and doctrine. The name "Jesus" (Greek "Ἰησοῦς") is significant as it means "Yahweh is salvation." This highlights the salvific work of Christ and His role as the ultimate revelation of God's truth. Historically, this reflects the early church's Christocentric focus, where all teachings and practices were measured against the life and teachings of Jesus. It serves as a reminder that true knowledge and wisdom are found in a relationship with Christ, who is the embodiment of divine truth.

Ye have heard him . . .--The true rendering here is, ye heard Him, and were taught in Him. St. Paul begins with the first means of knowledge, the "hearing" His voice, directly or through His ministers; and then proceeds to describe the fuller and more systematic process of "being taught," not "by Him" (as in our version), but "in Him," that is, in that unity with Him which embraces both teachers and taught as with an atmosphere of His presence.

As the truth is in Jesus.--Here by the name "Jesus," the personal and proper name of the Lord, St. Paul leads us on from the conception of "learning the Christ," to understand the method of that learning, in the knowledge of the "truth" in the person of Jesus Himself, who declares Himself to be the Truth (John 14:6). By a loving study and knowledge of His person, as set forth to us in the gospel, and brought home to us by His grace, rather than by abstract musing on the office and attributes of "the Christ," we come to learn the Christ also. The use of the simple name Jesus, so common in the Gospels, is rare indeed in the Epistles, where we constantly find the fuller description "Jesus Christ," "the Lord Jesus," "Jesus the Son of God." Wherever it occurs, it will be found to be distinctive or emphatic. This distinctiveness is most strikingly evident in Romans 8:11 : "If the Spirit of Him who raised up Jesus from the dead dwell in you, He that raised up [the] Christ from the dead shall also quicken your mortal bodies." The "raising up of Jesus," is the historical resurrection of Jesus of Nazareth; the "raising up the Christ" points to the mysterious effect of that resurrection on those for whom He is the Mediator. Of the few other passages in which the simple name occurs, some (as Romans 3:26; 2Corinthians 4:10-11; 1Thessalonians 1:10; Hebrews 10:10) are mere reiterations of the name occurring above with the due title of honour; others are quasi-recitals of a creed declaring the historic Jesus (1Corinthians 12:3; 1Thessalonians 4:14; comp. 2Corinthians 11:4). In the Epistle to the Hebrews, where, in accordance with one main purpose of the Epistle, this usage is least rare (see Hebrews 2:9; Hebrews 6:20; Hebrews 7:22; Hebrews 12:2; Hebrews 12:24; Hebrews 13:12), it will be found that in all cases, either special stress is laid on the lowly and suffering humanity of the Lord, or the historic facts of His ministry on earth are referred to. The modern familiarity of use of the simple name "Jesus" has little authority in apostolic usage. . . .