We have the words  of Jesus, teaching about the in dwelling presence of God. "I will ask the Father, and he will give another Advocate to you, so that he may abide with you for eternity: the Spirit of Truth, whom the world is not able to accept, because it neither perceives him nor knows him. But you shall know him. For he will remain with you, and he will be in you" (John 14:16-17)

Where the Spirit is, there is also the Father and the Son. We have the affirmation of this in the Catechism of the Catholic Church. "The ultimate end of the whole divine economy is the entry of God's creatures into the perfect unity of the Blessed Trinity. But even now we are called to be a dwelling for the Most High Trinity: 'If a man loves  me', says the Lord, 'he will keep my word, and my Father will love him, and we will come to  him, and make our home with him.'" (CCC 260)

We know what it means to remain or stay with another. But what does it mean for us to remain in Jesus and Jesus in us? There is an intimacy or bond of relationship in being with another. But there is a greater intimacy and a deeper bond of relationship in remaining in another and the other remaining in me. Each bears some fruit. The former bears the fruit of friendship or closeness, which could be temporary. The latter brings about a union or oneness, which could be permanent. Jesus remaining in me and I in him is meant to be eternal. It is his will and by his grace. It is my choice to respond and remain, not separating myself because of sin. How important is this intimacy for me?