The Safeguard Against Sinning is the Presence of Christ

QUESTION: Explain 1 John 5:18. 

"We know that whosoever has been begotten of God is not sinning, but he who was begotten of (aorist) of God (the only begotten Son) keepeth him."

ANSWER: My version is from the text of Westcott and Hort, considered the most accurate. The safeguard of the believer against sinning is the promised presence of Christ, "Lo, I am with you always." "Kept by the power of God through faith." If faith lapses, sin comes in. So long as the Christian is in probation he is within the bow-shot of the devil and every moment needs the shield of faith. To deny this is to teach a fanatical perversion of evangelical perfection.

— From Steele's Answers p. 20.