If you believe you become a brand new person
Faith in Christ Jesus causes you to be born again into a new and everlasting life.
The scripture puts it like this: Therefore if any man is in Christ, he is a new creature ; the old things passed away; behold, new things have come. (2 Corinthians 5:17)
Being born again into a brand new life, God provides His Holy Spirit to lead us, counsel us and guide us.
For all who are being led by the Spirit of God, these are sons of God. (Romans 8:14)
He was in the world, and the world was made through Him, and the world did not know Him. He came to His own, and those who were His own did not receive Him. But as many as received Him, to them He gave the right to become children of God, even to those who believe in His name, who were born not of blood, nor of the will of the flesh, nor of the will of man, but of God. (John 1:10-13)
If you believe on Jesus, you become a child of God, with the wonderful hope of seeing Him face to face one great day. The apostle John, the disciple closest to Jesus, wrote these words:
And now, little children, abide in Him, so that when He appears, we may have confidence and not shrink away from Him in shame at His coming. If you know that He is righteous, you know that everyone also who practices righteousness is born of Him. See how great a love the Father has bestowed upon us, that we should be called children of God; and such we are. For this reason the world does not know us, because it did not know Him. Beloved, now we are children of God, and it has not appeared as yet what we shall be. We know that, when He appears, we shall be like Him, because we shall see Him just as He is. And everyone who has this hope fixed on Him purifies himself, just as He is pure. (1 John 2:28-3:3)