What is fullness or the life of perfection according to the apostle Paul?

The apostle discusses fullness in a variety of ways. For instance, he says, “But he who is joined to the Lord is one spirit with Him” (1 Cor. 6:17); “Therefore, if anyone is in Christ, he is a new creation; old things have passed away; behold, all things have become new” (2 Cor. 5:17); “ but of Him you are in Christ Jesus, who became for us wisdom from God— and righteousness and sanctification and redemption” (1 Cor. 1:30); “being filled with the fruits of righteousness which are by Jesus Christ, to the glory and praise of God” (Phil 1:11); “that through these you may be partakers of the divine nature, having escaped the corruption that is in the world through lust” (2 Pet. 1:4). These echo the words of the gospel: “But as many as received Him, to them He gave the right to become children of God, to those who believe in His name: who were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God” (John 1:12–13).