Galatians 4:6-7 :
And because you are children, God sent out the Spirit of his Son into your hearts, crying, “Abba, Father!” So you are no longer a bondservant, but a son; and if a son, then an heir of God through Christ.
These verses reveal to us that God really is our personal Father and that because we are God’s children, He sends His Holy Spirit to live in us.
We can see here that the Holy Spirit is only given to God’s children, and when you find your heart calling out to God as “Abba, Father,” it is evidence of that fact, even though you don’t actually find your heart saying the word “Abba.”
Bible scholars tell us that the word “Abba” is a personal and respectful way of saying Father that was left untranslated in our English Bibles. It means that you cry out to God as your personal and dear Father. Another important thing to keep in mind about the Holy Spirit’s presence is that if the Holy Spirit is really in your heart, your heart will act like it. When you really believe in your heart that God is your dearest Father, you will want to act like Him. That’s what it says in other places in the Bible. We treat God like our Father when we copy Him.
There is no evidence here that you need to speak in a strange language or join a particular church group to prove it, but you must have a personal relationship with God as your own Father. This relationship was made possible by God through faith in Jesus who died for our sins.
The absolutely amazing thing about this is that as children of God through our relationship with Jesus, we inherit the things of God Himself. This is not done by the work we do for God at all. This is graciously given by Him to us. We did nothing to inherit the riches of God, but we got it anyway. That is who we are. We, as Christians, are the people to whom were given all things when we deserved the exact opposite. That is what makes us His special people. We serve as a example of what happens when God shines down on a person and gives him what he didn’t deserve.