.Philippians 2:12 NIV
 Therefore, my dear friends, as you have always obeyed—not only in my presence, but now much more in my absence—continue to work out your salvation with fear and trembling,
Philippians 2:13 goes on to say, “for it is God who works in you to will and to act in order to fulfill his good purpose.”
Ephesians 2:8-10 NIV
 For it is by grace you have been saved, through faith—and this is not from yourselves, it is the gift of God—  not by works, so that no one can boast.  For we are God’s handiwork, created in Christ Jesus to do good works, which God prepared in advance for us to do.
Romans 3:23-28 NIV
 for all have sinned and fall short of the glory of God,  and all are justified freely by his grace through the redemption that came by Christ Jesus.  God presented Christ as a sacrifice of atonement, through the shedding of his blood—to be received by faith. He did this to demonstrate his righteousness, because in his forbearance he had left the sins committed beforehand unpunished—  he did it to demonstrate his righteousness at the present time, so as to be just and the one who justifies those who have faith in Jesus.  Where, then, is boasting? It is excluded. Because of what law? The law that requires works? No, because of the law that requires faith.  For we maintain that a person is justified by faith apart from the works of the law.
James 2:22-26 NIV
 You see that his faith and his actions were working together, and his faith was made complete by what he did.  And the scripture was fulfilled that says, “Abraham believed God, and it was credited to him as righteousness,” and he was called God’s friend.  You see that a person is considered righteous by what they do and not by faith alone.  In the same way, was not even Rahab the prostitute considered righteous for what she did when she gave lodging to the spies and sent them off in a different direction?  As the body without the spirit is dead, so faith without deeds is dead.
In the verses above, we see that we are saved by grace and justified in Christ by faith in Him and His completed work. True faith will result in good works as we work out our salvation in Christ. But we are not saved because of our works. We are saved because of Jesus Christ. Our works in that salvation and sanctification are evidence of our true saving faith. If we were able to be saved by our own efforts, we could boast in our work we’ve done to save ourselves and we wouldn’t need the blood of Jesus to cleanse us because we would’ve attained salvation on our own merit. But the Bible clearly teaches us that Jesus is our savior. There is no other hope besides Him. We are saved only by faith in Him and the works He has done.
The 13th verse in the 2nd chapter of Philippians shows us that it is God who works in us and through us to fulfill His good purpose.
Galatians 2:20-21 NIV
 I have been crucified with Christ and I no longer live, but Christ lives in me. The life I now live in the body, 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 could be gained through the law, Christ died for nothing!”
If by faith we are truly crucified with Christ and have died to our old selves, and it is now Christ living in us, then our works, the evidence of our faith in Jesus, the result of true saving faith, are not our works but those of Christ working in us through us by the power of the Holy Spirit.
By faith we are saved, and works are a result of that most incredible salvation.