God initiates the relationship with us. He makes it possible, paving the way so that we can have fellowship with Him. Through this relationship, which He made possible through the gift of His Son, He desires to develop trust in us. Without that gift, without that expression of His love, the relationship never would have begun.
God is also the one who keeps the relationship going. If He did not do this, we would not have enough faith to trust Him, just like the Israelites of old. We would be too impatient, and we would not believe what He said. Obedience, loyalty, and devotion to Him would never be produced.
So, God keeps forgiving us. He keeps extending the hand, beckoning us to come back to the relationship. This is so clearly seen in the way God dealt with Israel in the Old Testament. Over and over, He forgave her and opened the way for her to come back. He deals no differently with us.
The key element in our salvation is this fellowship, which has been initiated through the death of Jesus Christ so that, through the relationship, we can begin to conform to the image of God by being permitted into His presence. If we do not do what is necessary on our part, giving our time and attention to the fellowship—to the relationship—nothing will happen.