Are you trying to perfect your faith via works? Galatians 1-3

Galatians 2:20 - 3:5 (NASBStr)

I have been crucified with Christ; and 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 up for me. I do not nullify the grace of God, for if righteousness comes through the Law, then Christ died needlessly.”

 You foolish Galatians, who has bewitched you, before whose eyes Jesus Christ was publicly portrayed as crucified? This is the only thing I want to find out from you:did you receive the Spirit by the works of the Law, or by hearing with faith? Are you so foolish? Having begun by the Spirit, are you now being perfected by the flesh? Did you suffer so many things in vain — if indeed it was in vain? So then, does He who provides you with the Spirit and works miracles among you, do it by the works of the Law, or by hearing with faith?

There is much debate in the circles of the church today about the role of the believer in the doctrine of Sanctification.   There are those who believe we have no responsibility to obedience on one end of the argument and their are those who believe, like the Galatians, who believe we must add to our salvation by being circumcised, or fulfill other requirements of the Law.   Paul wanted the Galatians to know that God had given them salvation by grace THROUGH faith and that the finishing of their salvation was also THROUGH faith.   That does not mean we don't work.  But, the works we do are done by Christ through us by faith.   We still must obey but our ability to obey is based in Galatians 2:20, Christ working in us.  The life we NOW live we live Faith in the Son of God.  We have two natures.  One is corrupt and dead in trespasses and sin.  The other is given to us at our new birth in Christ and we live in it through the Spirit. It is this last nature that produces anything worthy of glorifying God.  We can't glorify God in our old nature.  We can only glorify God in our new nature and that nature is Christ living through us via the Spirit.   That is the point of these verses above.   Christ came to live in us via the Spirit and we can't complete the work He is doing us via works but faith that produces works.   We don't try harder to live the Christian life.  We believe in Christ to work in our lives to produce the fruit of the Spirit; which is everything we use to measure the Christian walk (love, joy, peace, patients, etc).   We can't begin in faith and perfect it in the flesh.   Our flesh is dead in sin (our old nature).   We have a new nature via the presence of the Spirit.