"Examine yourselves, to see whether you are in the faith. Test yourselves. Or do you not realize this about yourselves, that Jesus Christ is in you?—unless indeed you fail to meet the test!"
-- 2 Corinthians 13:5
But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus his Son cleanses us from all sin.
--- 1 John 1:7
If we say we have no sin, we deceive ourselves, and the truth is not in us.
--- 1 John 1:8
And by this we know that we have come to know him, if we keep his commandments.
--- 1 John 2:3
Do not love the world or the things in the world. If anyone loves the world, the love of the Father is not in him.
--- 1 John 2:15
No one who denies the Son has the Father. Whoever confesses the Son has the Father also.
--- 1 John 2:23
Beloved, we are God's children now, and what we will be has not yet appeared; but we know that when he appears we shall be like him, because we shall see him as he is.
--- 1 John 3:2
No one born of God makes a practice of sinning, for God's seed abides in him; and he cannot keep on sinning, because he has been born of God.
--- 1 John 3:9
We know that we have passed out of death into life, because we love the brothers. Whoever does not love abides in death.
--- 1 John 3:14
Whoever confesses that Jesus is the Son of God, God abides in him, and he in God.
--- 1 John 4:15
Want to know if someone else is "born again?"
If someone says they are born again yet is "offended" by hearing the gospel
or
is "offended" at the suggestion that they are not saved, then they are
probably not really saved.
The gospel is "a rock of offense"
to those who are perishing.
(1 Peter 2:8)
"Not everyone who says to me, 'Lord, Lord,' will enter the kingdom of heaven, but the one who does the will of my Father who is in heaven.
On that day many will say to me, 'Lord, Lord, did we not prophesy in your name, and cast out demons in your name, and do many mighty works in your name?'
And then will I declare to them, 'I never knew you; depart from me, you workers of lawlessness.'"
Matthew 7:21-23
For the Lord to know you, you must build your house on a rock:
"Everyone then who hears these words of mine and does them will be like a wise man who built his house on the rock.
And the rain fell, and the floods came, and the winds blew and beat on that house, but it did not fall, because it had been founded on the rock.
And everyone who hears these words of mine and does not do them will be like a foolish man who built his house on the sand.
And the rain fell, and the floods came, and the winds blew and beat against that house, and it fell, and great was the fall of it."
Matthew 7:24-27