One purpose for which the Apostle John wrote the Letter of First John was to show his believing readers how they might be assured of the eternal life they in fact had. It is possible to be a true child of God and yet suffer from doubts and fears over your true state before God. But in such cases, we should remember that “God is greater than our hearts” and knows all things. His Spirit can witness to our spirit that we are the children of God
And we pray:
O Savior, it is easy for us to fear we may not know You if we do not hold tight to Your Word when we backslide into sin or when we are trusting our own feeble wills to make ourselves believe we are saved. But when we rely on Your Spirit to assure our hearts and let no cloud of sin come between us and Your Essence, then we have confidence towared You. Give Your children, we pray, such confidence in what You have done for us. Amen.