Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new.
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2 Corinthians 5:15-19
Jamieson, Fausset & Brown (1871) (public domain).
Therefore--connected with the words in Co2 5:16, "We know Christ no more after the flesh." As Christ has entered on His new heavenly life by His resurrection and ascension, so all who are "in Christ" (that is, united to Him by faith as the branch is In the vine) are new creatures (Rom 6:9-11). "New" in the Greek implies a new nature quite different from anything previously existing, not merely recent, which is expressed by a different Greek word (Gal 6:15). creature--literally, "creation," and so the creature resulting from the creation (compare Joh 3:3, Joh 3:5; Eph 2:10; Eph 4:23; Col 3:10-11).
Other Bible passages linked to this one, most cited first.
A new heart also will I give you, and a new spirit will I put within you: and I will take away the stony heart out of your flesh, and I will give you an heart of flesh.
That ye put off concerning the former conversation the old man, which is corrupt according to the deceitful lusts; And be renewed in the spirit of your mind; And that ye put on the new man, which after God is created in righteousness and true holiness.
Remember ye not the former things, neither consider the things of old. Behold, I will do a new thing; now it shall spring forth; shall ye not know it? I will even make a way in the wilderness, and rivers in the desert.
Jesus answered and said unto him, Verily, verily, I say unto thee, Except a man be born again, he cannot see the kingdom of God.
Create in me a clean heart, O God; and renew a right spirit within me.
And I will give them one heart, and I will put a new spirit within you; and I will take the stony heart out of their flesh, and will give them an heart of flesh:
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.