And I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of my hand.
John 10:28 (KJV)
After we receive Jesus no one and nothing can ever separate us from Him. We have been spiritually united with Christ for eternity, and no amount of mistakes or shortcomings on our part can undo this union. Our role is to receive His precious gift of righteousness, and all that comes with it, by faith.