The Holy Trinity in Christian Life
The new commandment of Christian life is “to be perfect as your heavenly Father is perfect” (Mt 5:48). It is to love as Christ himself has loved. “This is my commandment, that you love one another as I have loved you” (Jn 15:12). Men cannot live the Christian life of divine love in imitation of God’s perfection without the grace of the Holy Spirit. With the power of God, however, what is impossible to men becomes possible. “For with God all things are possible.” (Mk 10:27)
The Christian life is the life of God accomplished in men by the Spirit of Christ. Men can live as Christ has lived, doing the things that he did and becoming sons of God in Him by the power of the Holy Spirit. Thus, once more, the Christian life is a Trinitarian life.
By the Holy Spirit given by God through Christ, men can share the life, the love, the truth, the freedom, the goodness, the holiness, the wisdom, the knowledge of God Himself. It is this conviction and experience which has caused the development in the Orthodox Church of the affirmation of the fact that the essence of Christianity is “the acquisition of the Holy Spirit” and the “deification” of man by the grace of God, the so-called theosis.
The saints of the Church are unanimous in their claim that Christian life is the participation in the life of the Blessed Trinity in the most genuine and realistic way. It is the life of men becoming divine. In the smallest aspects of everyday life Christians are called to live the life of God the Father, which is communicated to them by Christ, the Son of God, and made possible for them by the Holy Spirit who lives and acts within them.