What Can the Trinity Teach Us About Evangelism?

“Trust is crucial. If we’re going to share our faith with integrity, we have to stand on a foundation of trust.”

While working on my Ph.D., I traveled regularly to the University of Durham in the U.K. for periods of study and research. I would stay at St. John’s College, taking my meals in the college dining hall. As a middle-aged, American woman among mostly 20-something, British undergraduates, I was an oddity. It was obvious that many of the students were curious, but mostly kept their questions to themselves until one evening a young man joined me at table.

After a few pleasantries, he asked what I was doing at St. John’s. I explained I was studying the theology of evangelism, which prompted an animated response. Apparently, that week on campus there had been focused, public, witnessing and he had much disdain for that approach.

As we talked, however, he mentioned he had a friend who had shared with him about Jesus Christ. When I asked the difference between these two types of sharing, he immediately responded that the public witnessing was evangelism, but the sharing of his friend was not—even though they provided the same information. The strangeness of this statement was evident even to him, yet he couldn’t put his finger on why. We continued talking as he slowly realized it had something to do with trust. He could receive information from his friend, whom he trusted, that he couldn’t receive from total strangers making public witness.

The Place of Trust

Trust is crucial. If we’re going to share our faith with integrity, we have to stand on a foundation of trust.

Unfortunately, trust isn’t very common in our current culture. Our society is built on trust, but studies show that in many areas—government, health care, education, the church—our current culture is infused with a dramatic sense of distrust.

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These feelings aren’t unfounded. We’re barraged with reasons not to trust, as people in positions of responsibility time and again fail to live up to the legitimate expectations attached to their positions. Yet, here is where it gets personal: Every time someone says they’re a Christian but fails to act like one, all Christians suffer—all Christians pay the price of lost trust.

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I won’t belabor the research, but a few examples are helpful. Many people outside the church think that we say one thing and do another, or are too focused on getting converts, or are judgmental and not honest about our attitudes toward others. The bottom line: They don’t trust that we love people the way we say we do.

Which raises a very good question: Do we?

We might be tempted to get defensive, but the hard truth is that people everywhere have encountered Christians—regular people like you and me—who profess to be Christians but do not behave like Christians. It may not be our reality; but it is their reality, and that, of course, makes it our problem. Clearly, we have much restorative work to do, which means our posture as we engage in evangelism is crucial.

A New Posture: Evangelism and the Trinity

There are many ways to “do” evangelism; it’s not one size fits all. But I believe what we do is not as important as the stance we take while we do what we do. It’s our way of being in the world that matters most, and this stance or “way of being” has to do with the theological foundation we stand on when we engage in evangelism.

Our theological foundation is important because evangelism is about making sure people are firmly planted in the kingdom of God, with roots deep and strong enough to begin a lifelong process of spiritual growth. This, in turn, means evangelism is a long-haul process. We have to be willing to walk with people for a long time as they explore this mysterious thing called faith; and while we walk with them, we need a particular posture, or way of being in the world.

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I believe it’s helpful to look at an element that’s missing from most discussions on evangelism: our understanding of the triune nature of God. Evangelism is never only about Jesus, even though Jesus is a vital part of the Trinity. Evangelism is also about creation—that self-giving, space-making activity of God that made something out of nothing. That is the model for our witness. As God makes room within himself for the otherness of creation, so Christians make room within themselves for others, especially others beyond the boundaries of the community of faith.

Evangelism is also grounded in God’s self-donation on the cross. Here is where Jesus enters the picture. At the core of faith is self-giving love, both manifested on the cross and demanded by it. It’s this self-giving core that grounds our way of being in the world. Because we’re remade in the image of Christ through baptism, we receive a new center for our life: self-giving love, which opens us up, makes us able and willing to give ourselves for others and to receive others into our very selves.

Here is the key: As God has embraced us, so we embrace others.

Evangelism is also grounded in the third person of the Trinity—God’s Holy Spirit. It is this power that invigorates us, going ahead of us and moving within us and between us and others. Without the presence of the Holy Spirit, evangelism is tepid and powerless. Therefore, as we model God’s space-making, self-giving activity, in creation and on the cross, we make space for God’s Holy Spirit to move, heal, save and transform.

That is our theological foundation. We can point to Scripture to expand and embellish, but this is the core of our stance: a Trinitarian understanding of the posture necessary for evangelism.

But what does that look like?