If our interactions with Christ can move from mere belief to a trusting relationship, then wonderful things such as obedience, holiness, and love follow. We Grow Up.
This kind of trusting relationship comes from knowledge of Christ. In one of his letters, Paul discusses knowledge of Christ and that knowledge leading to endurance, joyfullness, and an inheritance of God’s kingdom. He is not talking about knowledge, as in memorizing some facts and figures to regurgitate later but knowledge that comes from a relationship.
When my wife and I play games like Charades or Fish Bowl we have a way of understanding what each other is hinting at way before others are able to catch on. This is because we know each other well enough to know what is inside their head at a given moment.

That is the type of knowledge that Paul is talking about when it comes to knowledge of Christ. When I rely and trust Jesus to be who he says he is, then I am not just relying on facts to see me through my days but I am relying on the knowledge I have gained from interacting with Jesus and developing an understanding of what is close to the heart of Christ.
Could it be that the entirety of scripture is not to prove that God exists but to prove that God can be relied upon and trusted? This is a huge difference. When God is unhappy with his called out people, the Israelites, he doesn’t criticize their belief in him, he criticizes their disobedience and their willingness to chase after replacements for what God can bring them. Similarly, Jesus discusses people’s lack of faith, not their understanding of doctrine.
By combining knowledge of Christ, as described above, with trust in Christ we have a recipe for growth that can create individuals that can endure, that can withstand trouble, that can change the world. The early church is proof of this and we can be too.
*This post was inspired by portions of Scot McKnight’s book, The King Jesus Gospel.