Don't you believe that I am in the Father, and that the Father is in me? The words I say to you are not just my own. Rather, it is the Father, living in me, who is doing his work. Believe me when I say that I am in the Father and the Father is in me; or at least believe on the evidence of the miracles themselves (John 14:10-11).
Jesus’ expression, “I am in the Father and the Father is in me,” signifies the kind of unity he had with his father—the Father-Son relationship in the Trinity. The word ‘Trinity’ is not found in the Bible. It is a theological term that has come to be used by Christians to express the total oneness of the divine beings—the Father, the Son and the Holy Spirit. Due to the emphasis on monotheistic belief—one true God, the church struggled to explain the existence of three divine persons, which cannot be denied in the New Testament. So, they came up with this word, Trinity—one God in three persons. Well, no matter what terminology is used, it is true that these three divine beings are in total unity with love as these scriptures reveal.
But the Counselor, the Holy Spirit, whom the Father will send in my name, will teach you all things and will remind you of everything I have said to you (v. 26).
Jesus’ last speech to the disciples is amazingly filled with words that reveal secret things about himself, his relationship with the Father, and about his unique relationship with the disciples.
On that day you will realize that I am in my Father, and you are in me, and I am in you (v. 20).
The expression “I am in my Father” is the first half of the oneness formula—“I am in the Father and the Father is in me” as we have seen above. The second half of the formula is missing, and is replaced by “you are in me, and I am in you” with “you” referred to the disciples. Meditate upon these words. The disciples are now one with Jesus, which is so wonderful, but that is not all. They have now joined the same relationship Jesus had with the Father—by taking part even in the Trinity. Wow!
If anyone loves me, he will obey my teaching. My Father will love him, and we will come to him and make our home with him (v. 23).
Not only we have the Father and the Son dwelling in us, we have the Holy Spirit, and our bodies are temples of the Holy Spirit. Knowing this truth, we can surely see that death is no longer reigning over us, but we reign in life through Jesus Christ.
For if, by the trespass of the one man, death reigned through that one man, how much more will those who receive God's abundant provision of grace and of the gift of righteousness reign in life through the one man, Jesus Christ (Rom 5:17).
However, you need to combine this truth—not an idea—with your faith. Do not let it simply pass through mentally in your head.
For we also have had the gospel preached to us, just as they did; but the message they heard was of no value to them, because those who heard did not combine it with faith (Heb 4:2).