How to make and keep eternal friends

Friendship is one of the most overlooked aspects of human flourishing. In modern culture, friendship is often treated as optional or secondary—something less significant than marriage, romance, or family. 

Yet research indicates that the absence of close friends is directly tied to rising loneliness, poorer health outcomes, and a decline in social trust. The American Psychological Association reports, “Adult friendships, especially high-quality ones that provide social support and companionship, significantly predict well-being and can protect against mental health issues such as depression and anxiety—and those benefits persist across the life span.”

Researchers now speak openly of a “friendship recession.” I discussed this in my Denison Forum article, “Is your church a part of the friendship recession?” But, in short, only 59 percent of Americans said they had a best friend, down from 75 percent three decades earlier. Tragically, over one in ten respondents said they didn’t have a single best friend (12 percent). 

This article explores how friendships form, how they deepen, and how a unique category I call covenant friendship can provide a framework for a lifelong relational bond.

The ingredients of friendship

Research shows that time is one of the most critical factors in developing friendship. A 2018 study suggests that 50 hours of voluntary, unstructured time are needed to transition from an acquaintance to a casual friend, 90 hours to become a friend, and more than 200 hours to become a close friend. The number of hours needed to make those transitions may increase if stretched out over more than a few months. 

What matters is intentional shared life. Time spent in task-oriented contexts, like work, does not move the needle the same way as chosen leisure-based time together. The deeper the friendship, the more it depends on hours when both people freely choose each other’s company. 

Another layer of research comes from Robin Dunbar, whose work on human social networks suggests we can realistically maintain about 150 meaningful connections with smaller circles inside that number. Typically, we sustain about 50 friends, 15 close friends, and 5 intimates (this can include your spouse, though not every spouse fits as a close friend). Each layer reflects the limited bandwidth humans have for emotional investment. 

Alongside this, studies on proximity demonstrate how physical closeness shapes relational closeness. Festinger, Schachter, and Back showed that neighbors living near stairwells or mailboxes formed stronger ties because of frequent encounters. Thomas Allen’s research later confirmed that the likelihood of communication drops sharply after just thirty feet of separation. 

These studies prove that friendship is formed and sustained through time, intentionality, and proximity.

Four levels of friendship 

Building on modern friendship research, I propose four concentric circles of relationship: 

1. Casual 
2. Companion 
3. Close
4. Covenant

Each is defined not by rigid hour counts but by increasing levels of intentionality, vulnerability, and repair. 

Casual friendships form through proximity and shared environments; they require little emotional investment and dissolve easily when circumstances change. 

Companion friendships develop as people choose to spend regular time together and begin sharing parts of themselves, though emotional openness is still cautious. 

Close friendships emerge when consistent intentionality and mutual vulnerability reshape the relationship; here, trust is built through honest conversation, shared meaning, and the ability to repair conflict. 

Covenant friendships occupy the innermost circle. Hours together matter, but they are not enough. Covenant friendship requires a decision. 

Just as dating becomes marriage through a vow, close friendship becomes covenant through a mutual promise of presence, accountability, forgiveness, and permanence, a shared commitment to walk through life with one another with clarity and intention. 

Covenant friendship: on par with marriage? 

I describe covenant friendship as a sexless marriage. This is not to diminish marriage but to elevate friendship. 

Both require self-awareness, vulnerability, emotional resilience, and the ability to repair after conflict. Both resist silent exits or casual drifting. Both expect to endure for life. 

Marriage is confirmed publicly at a wedding, while covenantal friendships can be (more or less) undeclared. The difference also lies in form: marriage unites bodies and households, while covenant friendship unites souls and lives. Of course, marriage also unites souls and lives, which tells you that marriage is a covenantal relationship. 

In both, distance is never neutral. If separation happens, it must be named, explained, and lived with the goal of reunion. Drifting without communication is a betrayal of the covenant. 

Friendships move through these tiers not only through time but also through rituals and markers. Acquaintances become casual friends by saying yes to meals and sharing personal stories of increasing importance and privacy. Sharing your innermost sense of self, thoughts, and emotions is especially important for men; finding trustworthy friends is especially important for women. 

Casual friends become committed friends through established rhythms, entering each other’s homes, and showing reliability in times of need. Committed friends become covenant friends when the relationship is named and marked by rituals: regularly shared meals, annual traditions, conflict repair, and the willingness to carry each other’s burdens. These practices transform hours into intentional shared life. 

Friendship is not one thing. Research shows that time, proximity, and intentionality all shape depth. What is missing is a clear framework for distinguishing casual ties from lifelong bonds, thereby creating a low-liability relationship. 

Covenant Friendship names this difference. It is the highest tier of intentional shared life, equal in seriousness to marriage but different in form. In a time of loneliness and fractured community, reclaiming covenant friendship offers a path toward renewal, belonging, and resilience.

How deep are your friendships? 

How deep are your friendships? Scripture invites us to examine that question because the gospel does not simply save isolated individuals but draws us into a community that anticipates the world to come (Acts 20:28, 1 Peter 2:9-10, Revelation 7:9).

Jesus teaches that in the resurrection, people “neither marry nor are given in marriage” (Matthew 22:30). This is not a loss but a fulfillment. 

Marriage is a temporary signpost pointing to the ultimate union between Christ and his people (Ephesians 5:22-33). Once reality arrives, the sign is no longer needed. What remains in the age to come is a community bound together in perfect love, friendship with God, and friendship with one another. 

In other words, the relational life of Heaven is covenantal friendship. So begin by taking an honest stock of the friendships in your life today.

First, acknowledge the wider network of people around you, the casual friends. 

In God’s providence, none of these relationships are accidental. Coworkers, fellow church members, and neighbors—these are the ordinary places where Christian love is learned and practiced.

Second, look for the smaller group of people you enjoy and spend meaningful time with, i.e., companions. 

Scripture often assumes that friendship grows through ordinary rhythms of shared meals, labor, joys, and/or even hardships. Ask yourself, “How might I be more intentional in these everyday spaces?”

Third, consider the few close friends who have seen your struggles and stayed. 

These relationships are signs of God’s kindness and grace. But they also invite responsibility and would result in a level of sadness if you were to lose them. What would it look like for you to deepen these friendships through honesty, prayer, and mutual encouragement?

Finally, prayerfully identify one or two relationships that could become covenantal friendships. 

Remember, these are the relationships marked by vulnerability, constancy, curiosity, growth, truth-telling, repentance, and grace. These rarely emerge without clarity. So take the somewhat countercultural step: sit down with that friend and define the relationship. You might think you are a good friend to them, but they might not think the same of you. I’d encourage you to name your desire to walk together over time. Commit to regular presence and unstructured time in one another’s lives where deeper conversations naturally occur. 

So, in light of the world to come, what step can I take to proactively cultivate the kind of friendship that will last forever?

Above all, rest in this truth: Jesus has already called you His friend. He is the covenant Friend who will walk with you into the age where love is made complete. His friendship is not only your hope for eternity, it is the power that enables you to pursue deep friendships now. Like every friendship, a relationship with God requires time and intentionality.

How can you build that relationship today?