Hebrews 13:5 KJV
5 Let your conversation be without covetousness; and be content with such things as ye have: for he hath said, I will never leave thee, nor forsake thee.
If God knows you that means He will never forsake you, but if you live in self-deception He does not know you because you are a worker of iniquity but only God knows the heart:
Matthew 7:23 KJV
And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.
We must understand for grace to be put in its proper place that it is stronger enough to keep us from falling away in an utter sense. We know that God does not take His free Spirit away from us but He keeps us close to Him by his keeping and preserving grace.
Let us not live in self-deception but in a good conscience before God and man. Amen.