“Therefore, if anyone is in Christ, he is a new creation. The old has passed away; behold, the new has come.”
'Therefore' ties this verse to the argument just made about reconciliation in Christ — the newness isn't standalone, it flows from a finished work.
'New creation' is too strong a word for a mere adjustment — Paul reaches for Genesis language to say something entirely new has been born.
'If anyone is in Christ' is the one condition in the sentence — not performance, not history, just the position of being united to Him.
'Has passed away' is past tense — this isn't some distant future hope, it's an already-finished reality for anyone in Christ right now.
'Behold' asks for your attention — Paul wants you to actually stop and notice the newness, instead of living as if the old still ran the show.
Act: Name one old trait you still carry out of habit, and make one concrete choice today that reflects who you are now in Christ, not who you were.