For through the law [customs] I [Apostle Paul] died to the law, so that I might live to God.  I have been crucified with Christ [the Anointed One]; {20} and it is no longer I who live, but it is Christ who lives in me.  And the life I now live in the flesh [body] I live by faith in the Son of God [Jesus Christ], who loved me and gave himself for me.
New Revised Standard 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.