Just how much of God dwells within us? John 1-2

John 1:16

For of His fullness we have all received, and grace upon grace.

The theme of the book of John is repeated several times in the book, but in the following passage we have it stated succinctly:

John 20:30-31

Therefore many other signs Jesus also performed in the presence of the disciples, which are not written in this book; but these have been written so that you may believe that Jesus is the Christ, the Son of God; and that believing you may have life in His name.

John is writing so that we might believe the Jesus is the Son of God.   And, since He is the Son of God, in Him dwells all the fullness of God.   So, by that truth we know that when we dwell in Him (by faith) and He takes up His residence in us (via the Holy Spirit) we have all received that same fullness of God in us.   What John wants us to know is not only that Jesus is the Son of God but that through faith we have received Him and been declared Children of God, and as children of God we have received His fullness.  I simply terms that means we are complete.   We need nothing to make us important, known, or valuable.   We are, through Faith by Grace, filled with the fullness of the Son of God.    This is entirely by His grace.   It is not works, or because we have something special in us, but it is totally by His grace that we have received the fullness of the Son of God in us.   That means power, privilege, position and passion.    We can rejoice in this fullness.   We can allow that fullness to live out in us and give us new conduct in this world (Colossians 1:9-12).   We must rejoice that we have the fullness of the Son of God in us.  Note where else Paul uses the same term here:

 Ephesians 3:19

and to know the love of Christ which surpasses knowledge, that you may be filled up to all the fullness of God.

God wants us to know and experience His fullness!!!