Before repentance, our "love" for God was like what the uncalled in the world have for Him to this day. We loved a concept of God given us by tradition. We even had some part in devising it because we really did not know Him. If we acknowledge this reality, we will discover it was an idol! In principle, it was tantamount to bowing before a statue as the ancient pagans did. Those in the world cannot enter His Kingdom until they worship the true God, which is why the second resurrection is necessary. It is also why God says in such verses as Ezekiel 37:6, "I will put sinews on you and bring flesh upon you, cover you with skin and put breath in you; and you shall live. Then you shall know that I am the Lord."
The God of the Bible says in His Word that not a single person has ever known Him until He chose to reveal himself because before this happens no one knows what to look for in God. Both testaments say, "There is none righteous, no, not one; there is none who understands; there is none who seeks after God" (Romans 3:10-11; Psalm 14:1-3).
Human nature likes to think of itself as possessing certain virtues—that we were generous, kind, good-tempered, sincere, etc.—and that God saw these in us and chose us for His side. How can this be in light of these scriptures? Who is telling the truth? Though some do have virtuous qualities, God does not call such people because of them. Besides, these qualities fall far short of the image into which God is shaping us.
Some people like to say they have always believed God, yet what they believed was an idol, a syncretistic god devised by combining biblical truth and paganism. If what they say were true, Acts 18:27 could not also be true. We believe because faith is God's gift. We have what we have only because we are the objects of His choice. He chose the ones He did simply because He chose them. We can go no further. We have no claim to any praise in this regard. Instead, it should humble us, stun us, into overflowing praise, gratitude, obedience, and zeal that He has given so much to those so undeserving to receive it.
Humility begins when we properly recognize who and what we are in relation to the sovereign Creator and to fellow man, called and uncalled alike. We show humility by the choices we make, and these will largely be determined by our willing recognition of the immense value of God's loving revelation of Himself to us.