Ephesians 4:20

But ye did not so learn Christ; if so be that ye heard him, and were taught in him, even as truth is in Jesus: that ye put away, as concerning your former manner of life, the old man that waxeth corrupt after the lusts of deceit; and that ye be renewed in the spirit of your mind, and put on the new man, that after God hath been created in righteousness and holiness and truth.

Ye did not so learn Christ ... The "ye" here is emphatic. "Certainly, you, among whom I myself labored, did not learn Christ in such a manner as to allow living like Gentiles?' As Blaikie said, "To learn Christ" means "to learn all about Christ through complete acceptance and obedience of his teachings."[32]

If so be that ye heard him ... This is not a conditional but an idiomatic saying with the impact of "As surely as you have heard him."[33]

The old man to be put off ... This was the old man that lived like the Gentiles, as Paul had just described.

The new man to be put on ... Note that the "new man" is not man's doing at all, but God's. "That after God hath been created!" This simply means to "put on Christ." How is this done? Note:

Christians put on Christ in baptism (Galatians 3:26,27).

They put on the name of Christ (Matthew 28:18-20).

They put on (or receive inwardly) the mind of Christ (Philippians 2:5).

They put on "the body of Christ" in the sense of belonging to his spiritual body, the church.

They put on the manner of daily living that Christ exhibited.

They put on Christ in the sense of being "in Christ."

[32] W. G. Blaikie, op. cit., p. 151.

[33] William Hendriksen, op. cit., p. 212.