Galatians 2:20-21: “I have been crucified with Christ; it is no longer I who live, but Christ lives in me; and the life which I now live in the flesh I live by faith in the Son of God, who loved me and gave Himself for me. I do not set aside the grace of God; for if righteousness comes through the law, then Christ died in vain.”
Living by the grace of God is living in absolute dependence on God. It is Christ living His life fully in us, and not us trying to imitate the life of Christ. And as humbling as this may seem to man because of his self reliant tendency it is actually his only hope of glory.
And so, living by the grace of God is not an excuse for or compromise with human failures due to human weaknesses and infirmities. Rather it is God's answer for the possible triumph and excellence of all who will rely on Him in spite of their human infirmities.
The fall of man in the Garden of Eden brought humanity down into a chronic nature of spiritual death and helplessness. Therefore, the introduction of the grace of God through Jesus Christ to mankind provides God's solution to the bankruptcy of the spiritual resources of fallen humanity. Grace makes available to man God’s resources without any contribution of human inputs or works.
According to the Scriptures, works or human efforts contribute nothing to grace. Grace and works are completely incompatible. We cannot mix them. “And if by grace, then it is no longer of works; otherwise grace is no longer grace. But if it is of works, it is no longer grace; otherwise work is no longer work” (Romans 11:6).
Since grace excludes all human works, it provides man the opportunity to set aside the deficiencies of his own fallen nature and efforts and find the infinite power of God to live and function in the grace of God. What a glorious hope and opportunity grace brings to fallen man!
We begin true spiritual living by the grace of God. Born in a state of spiritual death and under the bondage of sin, a man can do absolutely nothing of himself to enter into spiritual life. Grace, God fully working in us, is the only means by which God could have quickened and raised us from spiritual death into life.
We read in Ephesians 2:4-9: “But God, who is rich in mercy, because of His great love with which He loved us, even when we were dead in trespasses, made us alive together with Christ (by grace you have been saved), and raised us up together, and made us sit together in the heavenly places in Christ Jesus, that in the ages to come He might show the exceeding riches of His grace in His kindness toward us in Christ Jesus. For by grace you have been saved through faith, and that not of yourselves; it is the gift of God, not of works, lest anyone should boast.”
So our very birth into Christian living was brought about by the grace of God. In other words, we made absolutely no contribution to our salvation. And this is wonderful because we know the work of our salvation is completely a work of God's excellence with no possible flaw introduced by any input of fallen humanity. Moreover, our salvation is intended by God to demonstrate the wonder of His grace: “that in the ages to come He might show the exceeding riches of His grace in His kindness toward us in Christ Jesus.” And so, our salvation by the grace of God essentially glorifies God and excludes all human efforts or works, lest anyone should boast of making a contribution to it.
The grace of God in Christ is therefore the foundation of our salvation. It is the fountain source of the birth or beginning of our Christian living. It means that salvation is the product of God’s work and not the work of man. So we can trust the excellence of our salvation because we can rely on the excellence of God’s work.