"We love Him because He first loved us." When we know from what we were delivered when we were regenerated, we are humbled. We begin to feel a sense of kinship to our Redeemer and we feel strong "family ties." We love Him first for what He has done for us, and then for Himself. We want to do what pleases Him and to avoid what displeases Him.
We know that we have been regenerated, that we have passed from death to life, when we love our brothers and sisters in Christ. I see that often on the PB: although there have been rancorous moments, the vast majority of disagreements or would-be horrendous conflicts are settled between members themselves by posts that show that the Holy Spirit is at work; He who deplores and sorrows over conflicts between God's children has made an outpouring of grace, mercy and love between two or more, and settled whatever arose. We sometimes realize that in order to do God's will, and because we love Him, we must cede ground to someone else. This is absolutely beautiful, and it happens over and over again. This could only happen between people who love God.
We know that we love God when we gravitate towards the pure, the noble, the lovely, etc. and away from that which is of the opposite nature, in every area of our lives. We don't watch TV shows that depict brutality, hatred of God and His creatures (those made in His image and likeness), vulgarity, obscenity, etc. because we hate what our Father hates. (Just one example for the sake of brevity.)
As we are progressively sanctified, we experience more and more of this. Stephen Charnock, in his "Existence and Attributes of God," says that even the degree of comfort we are given in our regenerate state is decreed by God in His sovereignty. We can backslide, of course; we can grieve the Spirit, but He who has begun a good work in us will be faithful to complete it. We realize more and more that to stray from Him is only to hurt ourselves, to cause ourselves more pain than we would otherwise have had and to, in some fashion, denigrate the effect of the sacrifice that our Lord Jesus Christ made for us, personally on the cross. Why would we do that? We don't want to do it, but... We are still in the flesh. Praise God, though: there is healing and deliverance (new mercies every morning, every hour of every day!) for us! He never tires of lifting us up, as long as it's to become closer to Him!
We must never lose our sense of gratitude to Him for what He has done for us, but if we do, what must we then do? Pray to get it back!
So often I fail; I am a wretched and miserable sinner. But I praise Him that I am not what I was before He saved me... The numbers of redeemed in Revelation are simply those who were regenerated, whose names were written in the Lamb's book of life, and who are destined to live with Him forever and ever.
I could go on and on, but I've said enough here...
Margaret