It is God who is the author (originator) of salvation. The Bibles says that Christians are justified by faith alone apart from the deeds of the law.
We are not justified by works of any kind. Salvation is a Gift which means that it is not earned by merit but simply bestowed upon the individual by Grace which means by God’s undeserving mercy because of Jesus Christ’s sacrifice at the cross.
Therefore by the deeds of the law there shall no flesh be justified in his sight: for by the law is the knowledge of sin. Romans 3:20
But that no man is justified by the law in the sight of God, it is evident: for, The just shall live by faith. Galatians 3:11
And be found in him, not having mine own righteousness, which is of the law, but that which is through the faith of Christ, the righteousness which is of God by faith: Philippians 3:9
The Galatians law keeper rejects “faith alone” (sola fide), misinterpreting James 2:2 4,3 by saying that a person is not justified by faith alone. Their argument is that Paul does not mean faith without works. These law keepers or Pharisees see good works of charity, as essential to justification. What James was saying is that if a man is saved by faith alone he will be benevolent based on a change of nature through the born again miracle and not as a means of justification.
By blending faith and works as a means of salvation the law keepers put themselves under law to be judged by the law and they will never be able to live up to God’s standard of perfection. For Jesus said to think a bad thought is sin. To hate is to kill and to lust is to commit adultery. Thinking is the same as doing according to Jesus Christ.
Saving faith is not mental assent to the gospel but rather a change of heart by the Holy Spirit. Jesus said YOU MUST BE BORN AGAIN TO SEE THE KINGDOM OF GOD!
Law keeping is the old sinful nature trying in a self righteous attitude to obey God but being born of God is the new creature serving God from a new heart –a changed nature.
Acts 16:14 says that Lydia, like those from Philippi and Ephesus, was a person “whose heart the Lord opened” to the Gospel. The heart (spirit) must be made new by God to be saved.
The reason that it is by faith alone is because Jesus Christ is enough and God’s grace is sufficient. “Therefore it is of faith, that it might be by grace;” Romans 4:16
Saving faith is a gift of God. One cannot drum up faith through his own recognizance. GRACE is the means of salvation and faith is the imputation (ascribing an attribution to another) of God’s righteousness through Jesus Christ.