John 14:20 (In His Disciples)
Jesus says:
In that day you will know that I am in my Father, and you in me, and I in you. — John 14:20 (ESV)
Read alone, language about being in each other can appear to mean being literally inside someone or having the same identity. Its setting across John 14, John 15, and John 17 needs closer reading.
The Greek preposition en, a small word that links words, is commonly translated “in” and has several possible meanings depending on context. The Perseus Greek Word Study Tool is a basic word reference; BibleHub’s Strong’s Greek 1722 entry collects Strong’s and Thayer’s Bible word-reference works and is not an original scholarly source. It lists “in, on, at, by, with, among”, including uses where “in” shows the means by which something happens. A word’s possible meanings alone do not determine its meaning in John 14–17; the surrounding passage and grammar control the sense. It should not automatically be read as being literally inside someone.
John 14 connects this language about being in each other with love, obedience, and the Father and Son making their home with the disciple. The context therefore describes presence in a relationship, not a statement that believers become identical with either the Father or the Son.
Whoever has my commandments and keeps them, he it is who loves me. And he who loves me will be loved by my Father, and I will love him and manifest myself to him.”
Judas (not Iscariot) said to him, “Lord, how is it that you will manifest yourself to us, and not to the world?”
Jesus answered him, “If anyone loves me, he will keep my word, and my Father will love him, and we will come to him and make our home with him.”
— John 14:21-23 (ESV)
John 15: Abiding and Dependence
“I am the true vine, and my Father is the vinedresser. Every branch in me that does not bear fruit He takes away, and every branch that does bear fruit He prunes, that it may bear more fruit. Already you are clean because of the word that I have spoken to you. Abide in me, and I in you. As the branch cannot bear fruit by itself, unless it abides in the vine, neither can you, unless you abide in me. I am the vine; you are the branches. Whoever abides in me and I in him, he it is that bears much fruit, for apart from me you can do nothing. If anyone does not abide in me he is thrown away like a branch and withers; and the branches are gathered, thrown into the fire, and burned. If you abide in me, and my words abide in you, ask whatever you wish, and it will be done for you. By this my Father is glorified, that you bear much fruit and so prove to be my disciples. As the Father has loved me, so have I loved you. Abide in my love. If you keep my commandments, you will abide in my love, just as I have kept my Father’s commandments and abide in His love. — John 15:1-10 (ESV)
This picture explains what being “in” Jesus means in the nearby passage. A branch remains connected to the vine, receives what it needs from it, and bears fruit through that dependence. Believers abiding in Jesus, and his words abiding in them, do not make believers Jesus. It describes continuing close relationship, dependence, and fruitful obedience.
The same context also distinguishes Jesus from the Father. Jesus abides in the Father’s love by keeping the Father’s commandments. The relationship is close and unified, while the Father and Son remain distinct.
John 17: Unity Shared With Believers
John 17 brings John 14 and John 15 together in Jesus’ prayer for those who would believe through the apostles’ message. Jesus asks that believers may be one and may be in the Father and the Son, as the Father is in him and he is in the Father (John 17:20-23).
This prayer does not make human believers divine. Rather, it presents the Father-Son relationship as the pattern and source of the unity requested for believers. In this context, language about being in each other can describe shared life, close relationship, unity, and representing one another without requiring being literally inside someone or having the same identity.
Trinitarian Reading and Response
Trinitarians, who believe that the Father, Son, and Holy Spirit are one God, commonly read the Father and Son being “in” one another in John 14:10-11 and John 17:20-23 as being inside each other. They see this as pointing to their unique shared divine nature, that is, what God is. This is a serious reading because the passages describe a very close and unique relationship between the Father and the Son.
The response is not that Jesus’ relationship to the Father is ordinary. Jesus is the Son sent and authorised by God (John 14:10). Yet John 17 uses similar “in” and unity language for believers for whom Jesus prays (John 17:20-23). The similar wording does not make believers divine, nor does it erase the uniqueness of the Son. It does show that the Greek word “in”, by itself, does not prove shared divine identity. The surrounding context must determine what relationship is being expressed.
Conclusion
John’s language about being “in” each other is best read through its contexts of abiding dependence, and shared unity. The Trinitarian reading and response show why the surrounding context must guide the meaning of these phrases. “In” alone does not establish being literally inside someone or having the same identity.