1 John 3:9
KJV
Whosoever is born of God doth not commit sin; for his seed remaineth in him: and he cannot sin, because he is born of God.
NIV
No one who is born of God will continue to sin, because God’s seed remains in them; they cannot go on sinning, because they have been born of God.
A born again believer has two natures: the old man and the new (Eph. 4:22-24, Col. 3:9-10). The old man is capable of sin (Rom. 7:17-18), but according to this verse (1 John 3:9), those who are born of God “cannot sin.” This provides absolute clarity on the doctrine of eternal security: the new man, being born of God, is incapable of sin and therefore cannot be lost. Modern translations shift the sense away from an absolute truth about our nature and turn it into a statement about our behavior.
Scripture taken from the Holy Bible, NEW INTERNATIONAL VERSION®, NIV® Copyright © 1973, 1978, 1984, 2011 by Biblica, Inc.® Used by permission. All rights reserved worldwide. NEW INTERNATIONAL VERSION® and NIV® are registered trademarks of Biblica, Inc. Use of either trademark for the offering of goods or services requires the prior written consent of Biblica US, Inc.