Mutual indwelling is a biblical concept expressing the sharing of a person's life in the life of another. In the Gospel According to John the evangelist presents Jesus as affirming that God the Father dwells in him: demonstrated in Jesus speaking the words of the Father and doing the will of the Father. This indwelling is mutual, as Jesus affirms, "The Father is in me and I am in the Father" (John 10:38b). Moreover, Jesus promises that the 'Spirit of Truth' will dwell in the disciples. Through the Spirit's action the disciples will know that Jesus dwells in the Father and will further know that Jesus dwells in them and they in Jesus (see John 14:20).
Mutual indwelling is a lens through which Christian thought and experience can be focussed; a lens that can correct the distortions of polarizing individualism. Below I offer, for discussion, 10 different facets of faith viewed through the lens of mutual indwelling.
1. Faith is the placing of one's trust in another, not merely in oneself.
2. The divine persons of Father, Son, and Holy Spirit constitute the one being of God by mutual indwelling.
3. The identity of persons, human and divine, is constituted by their sharing in the lives of other persons without absorption or loss of self-identity.
4. Matter and spirit are not opposed, since the Lord gives life by breathing his spirit into creatures, and in Christ the divine Word "became flesh and dwelled among us." (John 1:14)
5. Holiness is first of all openness to the indwelling of the Holy Spirit.
6. Prayer is attentiveness to the pleading of the indwelling Spirit of God. (See Romans 8:26-7)
7. Conscience is human moral knowledge interpenetrated and indwelled by the will of God. Discerning and doing the will of God is the ever-demanding task of being attentive and obedient to God as he informs conscience.
8. The Eucharist or Holy Communion is an intensification of the truth of the mutual indwelling of Christ and the Christian: "He who eats my flesh and drinks my blood dwells in me and I in him." (John 6:56), and also of the mutual indwelling of Christians as one in Christ "we, though many, are one body; for we all share in one loaf" (1 Corinthians 10:17).
9. The Church and Israel (that's the Jewish people of faith, not the post-1948 nation state) are not opposed but mutually interdependent, since the Church is grafted into root of Israel (see Romans 11:17-24).
10. Empathy—essential for healthy human relationships—is the imaginative indwelling of the experience of another person.

