Christ [Anointed One] redeemed [paid to recover] us from the curse of the law [customs, commands] by becoming a curse for us, for it is written: “Cursed is everyone who is hung on a tree [wood].” {14} He redeemed us in order that the blessing given to Abraham [founder of the Hebrew nation] might come to the Gentiles [non-Hebrews] through Christ Jesus, so that by faith [belief] we might receive the promise of the Spirit.
New International Version
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One way that we have been crucified with Christ is by relationship: we have become one with Christ, and His experiences are ours.  Our Christian life began when, in unity with Him, we died to our old life.  In our daily life, we must regularly crucify sinful desires that keep us from following Christ.  This, too, is a kind of dying with Him.