Proof?
"Being justified freely by his grace through the redemption that is in Christ Jesus:"
Romans 3:24, KJV
Titus 3:5
5 Not by works of righteousness which we have done, but according to his mercy he saved us, by the washing of regeneration, and renewing of the Holy Ghost;
Romans 8:38-39
38
For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come,
39 Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord.
Philippians 1:6
6 Being confident of this very thing, that he which hath begun a good work in you will perform it until the day of Jesus Christ:
"These things have I written unto you that believe on the name of the Son of God; that ye may know that ye have eternal life, and that ye may believe on the name of the Son of God."