Spiritual maturity looks like moving from spiritual milk to solid food. According to Hebrews 5, mature believers don’t just read the Bible; they study it. They don’t just study it; they apply it. And they don’t just apply it; they teach it to others. Maturity isn’t measured by how long you’ve been a Christian. It’s measured by whether you’ve moved from being a consumer to a contributor.
Maturity Isn’t Automatic
In 2018, a story made national headlines about a thirty-year-old man whose parents took him to court because he refused to move out of their house. He didn’t pay rent, didn’t help around the house, and ignored their written requests to leave. A judge finally ordered him to launch.
We laugh at stories like that, but Hebrews delivers a similar rebuke to churchgoers who had refused to grow up spiritually. They had been believers long enough to be teaching others, yet they still needed someone to teach them the basics.
Hebrews 5:12-14 In fact, though by this time you ought to be teachers, you need someone to teach you the elementary truths of God’s word all over again. You need milk, not solid food! Anyone who lives on milk, being still an infant, is not acquainted with the teaching about righteousness. But solid food is for the mature, who by constant use have trained themselves to distinguish good from evil.
Time in church doesn’t automatically produce spiritual maturity. Growth takes intention, and the passage points to three marks of a spiritual grown-up.
Mature Believers Study, Not Just Read
Milk isn’t bad. It’s exactly what babies need. But it’s tragic for adults to live on it. Spiritually speaking, milk is relying only on what other people say about God. If your only spiritual input is a sermon once a week, you’re on a liquid diet.
Reading the Bible is like taking a scenic drive. Studying it is pulling over to read the historical markers. One helpful approach is inductive Bible study: observe what the text says, interpret what it meant to the original audience, and then apply it to your life today. You can learn more about the difference between reading and studying the Bible.
2 Timothy 2:15 Do your best to present yourself to God as one approved, a worker who does not need to be ashamed and who correctly handles the word of truth.
Studying moves us from surface-level familiarity with Scripture to an understanding that actually shapes our lives.
Mature Believers Apply What They Learn
Hebrews says mature believers have “trained themselves” to tell good from evil. The Greek word behind “trained” is where we get the word gymnasium. Spiritual growth requires exercise, and the exercise is obedience.
You can know Greek word studies, debate theology, and listen to endless podcasts, but if you don’t obey what you know, you stay stuck. Application looks like forgiving when it’s hard, giving when it’s costly, and choosing integrity when no one is watching.
James 1:22 Do not merely listen to the word, and so deceive yourselves. Do what it says.
Information alone doesn’t transform us. Obedience does, and practiced obedience is what sharpens our ability to discern right from wrong.
Mature Believers Teach Others
The original readers “ought to be teachers” by now. That’s the launch. The goal of spiritual maturity isn’t self-improvement; it’s multiplication. Teaching doesn’t require a stage or a title. It can look like mentoring a new believer, leading your kids in faith, or walking alongside a friend who is asking questions.
Ephesians 4:14 Then we will no longer be infants, tossed back and forth by the waves, and blown here and there by every wind of teaching and by the cunning and craftiness of people in their deceitful scheming.
Teaching others actually stabilizes our own faith. When we pour out, we grow up. The cure for spiritual dullness isn’t more consumption; it’s contribution. God loves us too much to let us stay spiritual infants, and he has a feast and a purpose waiting for us.
The Takeaway
Spiritual maturity looks like studying God’s Word for yourself, putting it into practice, and passing it on to others. It isn’t about how long you’ve believed. It’s about whether you’ve launched from consumer to contributor.
