The prevailing false doctrine among Christendom, is salvation which involves "works." God says that you must have your faith in Jesus Christ for your salvation, and that you cannot do anything that will qualify yourself for Heaven. Yet many Churches still insist that you have to do something, such as sacraments, or do good works to be saved, or to strive or persevere to stay save or prove you're saved. God says if you are working for your salvation, then you don't have it.
Galatians 5:4 "You have been severed from Christ, you who are seeking to be justified by law; you have fallen from grace."
Galatians 2:21, “I do not nullify the grace of God, for if righteousness {comes} through the Law, then Christ died needlessly."
Galatians 2:16, “nevertheless knowing that a man is not justified by the works of the Law but through faith in Christ Jesus, even we have believed in Christ Jesus, so that we may be justified by faith in Christ and not by the works of the Law; since by the works of the Law no flesh will be justified.”
Galatians 3:24 Therefore the Law has become our tutor to lead us to Christ, so that we may be justified by faith.
Romans 11:6 But if it is by grace, it is no longer on the basis of works, otherwise grace is no longer grace.
Galatians 3:2-3 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?
The Bible says we're saved by God's grace alone, through our faith in Jesus Christ, and His atonement on the cross, to pay for all of our sins. We can't earn it, and don't deserve it, but only have it because of His grace, which He offered as a free gift. If we're trying to earn it on our own merits, then we don't have it.
Ephesians 2:8-9 "For by grace you have been SAVED through faith; and that not of yourselves, it is the GIFT of GOD; not as a result of works, so that no one may boast."
Ephesians 1:13 "In Him, you also, after listening to the message of truth, the gospel of your salvation -- having also believed, you were sealed in Him with the Holy Spirit of promise,"
Romans 4:5 "But to the one who does not work, but believes in Him who justifies the ungodly, his faith is reckoned as righteousness."