Galatians 2:19

For I through the law died unto the law, that I might live unto God.

"To live unto God" is to be in Christ who lives at God's right hand; where Christ is, there the Christian is; for because of his membership in Christ's spiritual body, there is a sense in which he "is Christ." Christ died, therefore we have died in his person on Calvary as our substitute. That is what Paul meant by saying, "We are baptized into his death." Through the Christian's being "in Christ," and identified with Christ, he has already perished upon the cross in the person of his substitute. "Being dead to sin but alive unto God in Christ" (Romans 6:11) has a meaning parallel with this verse. The Romans passage does not mean that "in Christ" the Christian is no longer tempted; but that "in Christ" the penalty of sin, which is death, is already paid upon behalf of the Christians by Christ who died on the cross. Here the thought is that "in Christ" Christians have already fulfilled all of the law, since that is what Christ' did; and we are "in him" and "of him." Also, there is here the thought that people are dead to the law through the body of Christ.