Note 4 at Jn. 1:16: It is evident from the context that John is speaking to believers and saying that all of us have received the fullness of Jesus. Those who reject the salvation which Jesus offers have not received the fullness of Jesus.

This is an awesome statement. Jesus had the fullness of the Godhead in Him (Col. 2:9) and to those who receive Jesus into their life, they also have the fullness of God in them. We are complete in Jesus (Col. 2:10). The rest of the Christian life is not trying to obtain more from God but rather renewing our minds to what we have already received through Christ (see note 3 at Mt. 26:41, p. 448).