Note the words of Catherine Mower LaCugna in God for Us: The Trinity and Christian Life:
The doctrine of the Trinity is orthodoxy, right perception of God, and it calls for orthopraxis, right response to the glory of God. Jesus Christ and the Spirit are the standard for both orthodoxy and orthopraxis. Jesus Christ’s life and death, words and deeds, knowledge and love of God are normative for Christians. The power of God’s Spirit to convert the hardened heart and make the blind see is essential both for right worship, right knowledge, and right love....
The doctrine [of the Trinity] succeeds when it illuminates God’s nearness to us in Christ and the Spirit. But it fails if the divine persons are imprisoned in an intradivine realm, or if the doctrine of the Trinity is relegated to a purely formal place in speculative theology. In the end God can only seem farther away than ever.
Preaching and pastoral practice will have to fight a constant battle to convince us, to provide assurances, to make the case that God is indeed present among us, does indeed care for us, will indeed hear our prayer, and will be lovingly disposed to respond. If, on the other hand, we affirm that the very nature of God is to seek out the deepest possible communion and friendship with every last creature, and if through the doctrine of the Trinity we do our best to articulate the mystery of God for us, then preaching and pastoral practice will naturally fit with the particulars of the Christian life. Ecclesial life, sacramental life, ethical life, and sexual life will be seen clearly as forms of trinitarian life: living God’s life with one another (pp410-411).As we study trinitarian-incarnational theology, let's be sure always to ask, "What difference does this make in how we live?" For example, how will understanding that God loves, forgives and accepts all people in Christ change the way we relate to people (believers and non-believers)? What difference will it make in how we view and participate (or not participate) in politics? What difference will it make in how we relate to our wives and children?
Important questions, these. And there are many others.