"The Spirit itself beareth witness with our spirit, that we are the children of God" (Romans 8:16)
I know what Charles Wesley meant when he wrote, "His Spirit answers to the blood, And tells me am born of God!" No one had to come and tell m what he meant. "Those who are willing to do my will," said Jesus in effect, "shall have a revelation in their own hearts. They shall have an inward illumination that tells them they are children of God."
If a sinner goes to the altar and a worker with a marked New Testament argues him into the kingdom, the devil will meet him two blocks down the street and argue him out of it again. But if he has an inward illumination - that witness within - because the Spirit answers to the blood, you cannot argue with such a man ... He will say, "But I KNOW!"
A man like that is not bigoted or arrogant; he is just sure. This is normal Christianity. That is the way we should be. If anyone chooses to do God's will, he will find out. He will know.
If you are a friend of God, God will be an everlasting friend to you. Nothing shall separate you from His love.
~A. W. Tozer~