"See what love the Father has given us, that we may be called children of God." 1 John 3: 1
"I have made known to them thy name, and I will make known unto them, that the love with which thou hast loved me may be in them, and I in them." John 17:26
Dazzled by the love of God, the Apostle John invites us to share his astonishment, admiration and wonder : all who have received God's forgiveness in Jesus Christ have the right to be called "children of God" (John 1: 12). And we are, with all the privileges attached to it! It does not become so by multiplying good works, by being a member of a church, or doing our best - but by receiving Jesus Christ in us, believing in his name, that is, believing what he is.
Let us marvel ! God offers us the possibility of maintaining a personal and intimate relationship with him, and of living happily with our Father, feeling the affection that reigns in a family.
Let us marvel ! God saved us from eternal perdition by giving His only begotten Son to bear our sins on the cross. But God did more than that : in His sovereign grace He adopted us as His children. We can listen to him and speak with confidence.
Let us marvel ! By adoption, God gives us from the outset all the privileges of a son or daughter ; It allows us to benefit already from the treasures that belong to it ; We are not like children who have to wait for their majority to take possession of an inheritance.
We do not believe that we need to reach a high spiritual level for God to truly adopt us as His children: some believers think that on earth they are in the exam period preceding the adoption of a child by one couple. This is not the case : let us have faith in the divine promises contained in the Bible, and consider ourselves already as God's children in their own right !
Let us marvel! If we behave as sons of God, we will reflect the characters of our Father. This will be seen and God will be glorified.
Source (To pleasing the Lord)