Works Cannot Save

For all of us have become like one who is unclean, And all our righteous deeds are like a filthy garment; And all of us wither like a leaf, And our iniquities, like the wind, take us away. (Isaiah 64:6 NASB)

Many people do good works to gain salvation. But God consider our good works as filthy garment. They are not acceptable. They have to be washed in the blood of the Lamb to be clean. God Himself will provide the garments of salvation.

These are the ones who come out of the great tribulation, and they have washed their robes and made them white in the blood of the Lamb. (Revelation 7:14 NASB)

I will rejoice greatly in the LORD, My soul will exult in my God; For He has clothed me with garments of salvation, He has wrapped me with a robe of righteousness, As a bridegroom decks himself with a garland, And as a bride adorns herself with her jewels. (Isaiah 61:10 NASB)

Good works does not save. However, all Christians are saved to do good works for the glory of God.

For we are His workmanship, created in Christ Jesus for good works, which God prepared beforehand so that we would walk in them. (Ephesians 2:10 NASB)