“Because you are already new in Christ, be about becoming what you are. Don’t ever think spiritual growth is optional or marginal in the Christian life.” — John Piper
Spiritual growth is one of those phrases Christians use frequently but often struggle to define.
Ask ten believers what spiritual growth looks like, and you’ll likely receive ten different answers.
Some will describe increased Bible knowledge.
Others will point to consistent church attendance.
Some will focus on prayer.
Others will emphasize serving, giving, evangelism, or accountability.
While all of those can be important aspects of spiritual maturity, none of them fully capture what spiritual growth actually is.
The danger is that we can easily mistake activity for maturity.
We can become busy without becoming godly.
Knowledgeable without becoming wise.
Disciplined without becoming transformed.
In fact, one of the greatest misconceptions about spiritual growth is that it is simply a Christian version of self-improvement.
It isn’t.
Nor is spiritual growth merely learning how to manage sin more effectively.
Spiritual growth is not behavior modification.
It is heart transformation.
It is the ongoing work of God conforming believers into the image of Jesus Christ.
The Apostle Paul describes God’s ultimate purpose this way:
“For those whom he foreknew he also predestined to be conformed to the image of his Son” (Romans 8:29).
Notice the goal.
Not merely better habits.
Not greater productivity.
Not even increased religious activity.
The goal is Christlikeness.
Spiritual growth is becoming more like Jesus.
Everything else is secondary.
Growth Begins with New Life
Before discussing spiritual growth, we must first discuss spiritual life.
Growth is impossible without life.
A tree grows because it is alive.
A child matures because he is alive.
Likewise, spiritual growth is only possible because believers have been made spiritually alive through faith in Christ.
Jesus described salvation as being “born again” (John 3:3).
Paul explained it this way:
“If anyone is in Christ, he is a new creation” (2 Corinthians 5:17).
This is why John Piper’s observation is so important:
“Because you are already new in Christ, be about becoming what you are.”
The Christian life is not about becoming someone entirely different through personal effort.
It is about growing into the person God has already declared you to be in Christ.
Growth flows from identity.
It does not create it.
You do not pursue spiritual growth so God will accept you.
You pursue spiritual growth because He already has.
Spiritual Growth Is a Matter of the Heart
When Scripture discusses spiritual maturity, it consistently directs our attention beneath the surface.
God is always after the heart.
External behavior matters, but behavior is ultimately the fruit of deeper realities.
Jesus taught:
“Out of the abundance of the heart the mouth speaks” (Matthew 12:34).
Actions reveal affections.
Behavior reveals belief.
Choices reveal desires.
This is why spiritual growth cannot be reduced to a checklist.
A person may read the Bible daily while remaining spiritually stagnant.
Another may volunteer every week while harboring bitterness, pride, or self-righteousness.
Spiritual growth is not measured primarily by what we do.
It is measured by who we are becoming.
The question is not merely:
“What Christian activities am I performing?”
The deeper question is:
“Is my heart becoming more aligned with God’s heart?”
Growing Desires
One of the clearest indicators of spiritual growth is a growing desire for God.
The Christian life begins with new affections.
We begin to want different things.
Not perfectly.
Not consistently.
But genuinely.
Peter describes spiritual infancy this way:
“Like newborn infants, long for the pure spiritual milk, that by it you may grow up into salvation” (1 Peter 2:2).
Notice that growth begins with longing.
Healthy spiritual growth involves increasing hunger for God’s Word, God’s presence, God’s people, and God’s purposes.
This doesn’t mean believers always feel spiritually energized.
Feelings fluctuate.
Desire often flickers.
But even a flicker can become a flame when nourished by God’s grace.
A helpful question is:
Do I genuinely want to know God more than I did a year ago?
Growth often begins there.
Growing Discernment
Spiritual growth also produces greater discernment.
The mature believer increasingly sees life through a biblical lens.
Hebrews 5:14 says:
“Solid food is for the mature, for those who have their powers of discernment trained by constant practice to distinguish good from evil.”
Discernment is more than identifying obvious sin.
It is the ability to evaluate life according to God’s wisdom.
Discernment helps us distinguish:
- Truth from error.
- Wisdom from foolishness.
- Eternal priorities from temporary distractions.
- What is merely good from what is best.
As believers mature, they become less dependent upon cultural narratives and more dependent upon biblical truth.
They learn to think God’s thoughts after Him.
Spiritual growth sharpens spiritual vision.
Growing Obedience
Jesus never separated learning from obedience.
Knowledge without obedience is not maturity.
It is merely information.
This is why spiritual growth requires teachability.
A mature believer remains receptive to correction, instruction, and conviction.
John Piper once observed:
“The pathway to maturity is not first becoming an intelligent person, but becoming an obedient person.”
Obedience does not earn God’s favor.
It demonstrates our trust in Him.
The spiritually growing person increasingly responds to God’s Word with:
“Yes, Lord.”
Not perfectly.
But consistently.
The direction of life becomes one of submission rather than resistance.
Growing Appetite
Every living thing is shaped by what it consumes.
The same is true spiritually.
One of the most revealing questions believers can ask is:
“What am I feeding my soul?”
We live in an age of unprecedented content consumption.
News.
Social media.
Podcasts.
Entertainment.
Streaming services.
Online arguments.
Infinite distraction.
None of these are necessarily sinful, but all of them shape us.
Spiritual growth requires intentional feeding.
Healthy believers consistently consume God’s truth.
They prioritize Scripture.
They cultivate prayer.
They engage in worship.
They seek teaching that strengthens faith.
Growth occurs when God’s truth increasingly outweighs the world’s influence.
What feeds the soul ultimately forms the soul.
Growing Participation
Many Christians mistakenly view spiritual growth as primarily personal.
Yet maturity inevitably moves outward.
Growth results in participation.
God never calls believers to spectatorship.
He calls them into His mission.
Ephesians 2:10 reminds us:
“We are his workmanship, created in Christ Jesus for good works, which God prepared beforehand, that we should walk in them.”
Spiritual growth involves discovering where God is already at work and joining Him there.
Mature believers increasingly ask:
- How can I serve?
- How can I encourage?
- How can I contribute?
- How can I make Christ known?
Growth moves us beyond consuming spiritual benefits toward becoming spiritual contributors.
Growing Love
Ultimately, spiritual growth becomes visible through love.
Not theological sophistication.
Not ministry accomplishments.
Not Bible trivia expertise.
Love.
Jesus said:
“By this all people will know that you are my disciples, if you have love for one another” (John 13:35).
Love is the unmistakable evidence of spiritual maturity.
A growing Christian becomes:
- More patient.
- More gracious.
- More forgiving.
- More compassionate.
- More generous.
- More humble.
Love increasingly governs responses, relationships, and priorities.
This is why Paul could write that even remarkable spiritual achievements are meaningless without love (1 Corinthians 13).
The truest measure of spiritual growth is not how much you know.
It is how much you love.
Progress, Not Perfection
One reason believers become discouraged is because they expect spiritual growth to happen quickly.
Growth rarely works that way.
Trees do not mature overnight.
Neither do Christians.
Spiritual growth is often gradual.
Invisible.
Uneven.
There are seasons of rapid progress and seasons of apparent stagnation.
Yet God remains faithful throughout the process.
Paul assures believers:
“He who began a good work in you will bring it to completion at the day of Jesus Christ” (Philippians 1:6).
The question is not whether you’ve arrived.
You haven’t.
Neither have I.
The question is whether God is continuing His work within you.
Are your desires changing?
Is your discernment deepening?
Is your obedience increasing?
Is your appetite for God’s Word growing?
Are you participating in His mission?
Are you becoming more loving?
Those are the signs of spiritual growth.
Not perfection.
Progress.
Because spiritual growth is not optional.
It is the inevitable result of God’s transforming work in the life of every believer.
And the ultimate goal is not simply becoming a better version of yourself.
It is becoming more like Christ.