Just Grow Up!

What psychology, neuroscience, and theology all say about the long work of becoming whole.

We've all said it. Maybe not out loud, but we've thought it. About the colleague who can't take feedback without sulking. The family member who turns every gathering into a drama. The friend who's still reliably doing the same self-defeating thing they were doing fifteen years ago. Maybe even, in a quiet moment of uncomfortable honesty, about ourselves.

Just. Grow. Up.

It feels satisfying to say. It feels true in the moment. But the more you understand about how human beings actually develop: emotionally, neurologically and psychologically, the more you realise how unfair and unhelpful it is as a response.

Not because it's wrong to want people to mature. But because emotional growth is not a switch people can flick. It has a history. It has a biology. And if you're someone who is a believer in Christ; it has a spiritual dimension that the Word has been alluding to for thousands of years.

What Does It Actually Mean to 'Grow Up'?

Emotional maturity isn't the same as chronological age. We all know this intuitively. We've met twenty-five-year-olds who handle conflict with such grace, and sixty-year-olds who throw tantrums when they don't get their way. So what is it, really?

Psychologist Dan Goleman, who introduced emotional intelligence into our every day life, describes it as a cluster of capacities: the ability to know what you feel, to manage those feelings, to empathise with others, and to navigate relationships with skill. None of these come automatically. They develop, or fail to, depending on what happens to us, especially in our earliest years.

Erik Erikson, one of the great theorists of human development, mapped out the psychological tasks we need to complete at different life stages: trust, autonomy, initiative, industry, identity, and more. Miss one significantly, and it tends to follow you. Not as a sentence, but as unfinished business that keeps showing up.

The Attachment Blueprint

Attachment theory, developed by John Bowlby and expanded by Mary Ainsworth, gives us one of the most powerful frameworks for understanding why some people seem emotionally stuck. The central idea is this: the quality of our earliest bonds with caregivers doesn't just shape our childhood. It shapes the internal model we carry into every relationship for the rest of our lives.

Children whose early needs were met consistently and warmly develop what we call secure attachment; they grow up with a fundamental sense that they are lovable, that others can be trusted, and that closeness is safe. Children whose caregivers were inconsistent, absent, frightening, or overwhelming develop insecure patterns: anxious, avoidant, or disorganised, that become the nervous system's template for how relationships work.

These aren't just emotional preferences. They are deeply wired patterns. And they show up in adults who seem, from the outside, to simply be choosing to behave badly. The person who can't stop clinging in relationships, the one who shuts down the moment things get emotionally intense, the one who swings between desperate closeness and sudden coldness; these are, very often, attachment patterns running on autopilot. Old programmes in adult bodies.

What's Happening in the Brain

Neuroscience adds another layer of understanding. Daniel Siegel, a clinical professor of psychiatry who has spent decades mapping the intersection of brain science and human relationships, describes what he calls 'flipping the lid', the moment when the emotional alarm system (the amygdala) fires so intensely that it effectively cuts off access to the rational, empathic, impulse-controlling prefrontal cortex.

In those moments, a person is not choosing to be immature. They are running on pure survival response: fight, flight, or freeze, with their 'adult brain' temporarily offline. In children, this is expected. In adults, it can look like cruelty, chaos, or childishness. But it has the same root.

Bessel van der Kolk's landmark work The Body Keeps the Score demonstrates that early trauma, and this includes emotional neglect, not just dramatic events, actually changes the structure and function of the developing brain. It can leave people with a hair-trigger stress response, limited capacity for self-regulation, and patterns that look, from the outside, like a refusal to grow up.

The truth is harder and more compassionate than that: for some people, the neurological and psychological conditions required for emotional maturity were never adequately provided. Simply put: there is no pathway for it.

Fragmentation: The Parts Left Behind

There's also the concept in psychology called fragmentation. It is the idea that when experiences overwhelm our capacity to process them, parts of us get, in a sense, frozen. Richard Schwartz's Internal Family Systems model describes this as 'parts': some that function as capable adults, and some that are still carrying the weight of old hurt, still operating from the perspective of a much younger self.

This is why a highly competent professional can completely fall apart when they feel criticised. Why a warm and generous friend might become suddenly cold when they feel left out. Why a loving parent occasionally reacts to their child's behaviour with something that looks more like sibling rivalry than parental authority. It's not the whole person acting. It's a part, a younger, frightened part that hasn't yet been integrated.

Gabor Maté, writing extensively on trauma and its effects, frames much of what we call personality or character as the adaptive response of a developing person to an environment that was painful, unpredictable, or unsafe. 'Show me the behaviour,' he writes, 'and I'll show you the wound.'

What The Word Says About Growing Up

"When I was a child, I talked like a child, I thought like a child, I reasoned like a child. When I became a man, I put the ways of childhood behind me." 1 Corinthians 13:11.

Paul's famous words are often quoted as if maturity is simply a decision, you just put childish things behind you, and that's that. But read in context, embedded in his description of love in 1 Corinthians 13, the verse expresses a much deeper meaning. Maturity isn't just about behaviour. It's about moving into a fullness of love: patient, kind, not self-seeking, not easily angered, keeping no record of wrongs. The kind of love that most of us, if we're honest, find genuinely hard.

The biblical vision of maturity is not primarily about competence or control. It's about formation into the image of Christ; a slow, often painful, deeply relational process.

"...until we all reach unity in the faith and in the knowledge of the Son of God and become mature, attaining to the whole measure of the fullness of Christ. Then we will no longer be infants, tossed back and forth by the waves..." Ephesians 4:13–14.

Paul uses the image of infants being tossed by waves, emotionally reactive, easily destabilised, pulled in any direction by whatever wind is blowing. The contrast is maturity: rootedness, stability, the capacity to remain grounded when things are hard. This isn't achieved by willpower. In Ephesians 4, it's described as the work of the body, of relationship, of learning, of being built up together.

Emotional maturity, in the New Testament vision, is a communal project.

"We know that the whole creation has been groaning as in the pains of childbirth right up to the present time... and we ourselves groan inwardly as we wait eagerly for our adoption to sonship, the redemption of our bodies." Romans 8:22–23.

In this verse, Paul doesn't pretend the process of becoming is comfortable or quick. There's groaning involved. There's waiting. There's a gap between where we are and where we're headed. Our walk as believers, in this framing, is not a life of people who have arrived; it's a life of people who are, with hope, in process.

This is very consistent with what neuroscience tells us about the brain's capacity for change. Neuroplasticity, the brain's ability to form new pathways throughout life, means that change is always possible. But it requires conditions: safety, relationship, repetition, and time. In theological terms, we might call those conditions grace, community, practice, and patience.

The Image of God and the Interrupted Self

Genesis 1 tells us that human beings are made in the image of God: the Imago Dei. Whatever else this means, it includes the capacity for relationship, reflection, responsibility, and love. These are the very qualities that emotional maturity develops: the ability to be present to another person, to reflect on your own inner life, to take responsibility for your actions, to love in ways that cost you something.

When development is interrupted, when a child grows up in an environment that is unsafe, chaotic, cold, or traumatic; the full expression of that image is distorted. Not destroyed. But pressed down, defended against, fragmented. The person who acts immaturely is not someone who has lost their identity in Christ. They are someone whose full identity hasn't yet had the conditions to flourish.

Theology has always understood human beings as simultaneously made for glory and marked by the effects of living in a broken world. The theological language of sin and fallenness can sometimes be used harshly, as if all struggles are simply moral failure. But a more nuanced study acknowledges that human beings are complex, that we are shaped by forces we did not choose, and that restoration is always the pathway of grace.

"He who began a good work in you will carry it on to completion until the day of Christ Jesus." Philippians 1:6.

This is one of the most encouraging promises in the New Testament. Growth is not our project to complete by willpower. It is something God is doing in us, through us, often slowly, and often in ways we can barely perceive. That doesn't remove our responsibility. But it does remove the pressure of self-improvement as the engine of change. We participate. We cooperate. We show up. But the work is held.

Conclusion

So what do we do with all of this: the neuroscience, the psychology, the theology?

First: we extend understanding. Not as a licence for harmful behaviour, but as a recognition that the person who acts immaturely is almost always carrying a story. There is a history behind the pattern. That doesn't mean we have to accept everything but it should soften our contempt.

Second: we hold the tension between explanation and expectation. We can understand why someone behaves as they do and still believe they are capable of more, still hold a boundary, still name the impact.

Third: we turn the mirror around. One of the most significant markers of emotional maturity is the willingness to ask, 'Where am I still growing?' Not as self-condemnation but as honest curiosity. Where is my amygdala still running old programmes? Where have I not yet put childish things behind me?

And fourth: we trust the process. In both psychological and spiritual terms, human beings are creatures in formation. We are not finished. We are not supposed to be. The groaning Paul describes in Romans 8 is not the sound of failure. It is the sound of something alive, growing toward its fullness.

Just grow up. Perhaps the truest version of that invitation is not a criticism; it's a calling. And one we're all, in different ways, still answering.

Be blessed in the might name of Yeshua!

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