Paul is our example of having crucified the old man. He testified, “I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me…” (Gal. 2:20).
This crucifixion was a crucifixion to the world. He said, “But God forbid that I should glory, save in the cross of our Lord Jesus Christ, by whom the world is crucified unto me, and I unto the world” (Gal. 6:14).
This death to the world was a death to the rudiments of the world and the ordinances made by men of the world. He asks the Colossians (who had been crucified to the world), “Wherefore if ye be dead with Christ from the rudiments of the world, why, as though living in the world, are ye subject to ordinances, (Touch not; taste not; handle not; Which all are to perish with the using;) after the commandments and doctrines of men?” (Col. 2:20-21).
The old man walked like the rest of the world (Eph. 2:2-3) and loved the world and the things of the world the same way the world does (1 John 2:15-17). The new man has responded to the first gospel sermon: “And with many other words did he testify and exhort, saying, Save yourselves from this untoward generation” (Acts 2:40).
The new man has agreed to fulfill his part of the covenant: “Wherefore come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you, And will be a Father unto you, and ye shall be my sons and daughters, saith the Lord Almighty” (2 Cor. 6:17-18).
Paul had done this. He testified, “But what things were gain to me, those I counted loss for Christ. Yea doubtless, and I count all things but loss for the excellency of the knowledge of Christ Jesus my Lord: for whom I have suffered the loss of all things, and do count them but dung, that I may win Christ” (Phil. 3:5-9).