In the early 20th century, Henry Ford called in a famous electrical engineer named Charles Steinmetz to diagnose a massive generator that nobody could figure out. For two days, Steinmetz observed the machine without touching it. Then he climbed a ladder, made an X with a piece of chalk on the side of the generator, and told the engineers to remove a plate at that mark and replace 16 windings from the field coil. They did it. The machine worked.

Ford was thrilled until the invoice arrived: $10,000. He asked for an itemized bill. Steinmetz sent one back with two line items. Making a chalk mark on the generator: $1. Knowing where to make the mark: $9,999. Ford paid it, because it was worth it.

That story has everything to do with how we grow spiritually.

Most of us know something is off. We can feel the friction in our relationships, the patterns that keep repeating, the places where we keep falling short. What we can't always see is exactly where the work needs to be done. That's what some call plank surgery: the slow, honest work of removing the blind spots in our own lives before we focus on everyone else's faults.

The good news is you're not doing this alone.

The Holy Spirit Knows Where to Make the Mark

The first step in plank surgery is asking the Holy Spirit for courage and insight. Not just insight, but courage too, because seeing your own blind spots clearly requires both.

The Holy Spirit has been observing you your whole life. He knows the patterns, the tendencies, the places where dysfunction is quietly running the show. When you sit before Him and ask, "Lord, where's the X mark? Where does the work need to be done?" you're inviting the one Person who actually knows the answer to speak into it.

That's not a passive prayer. It takes courage to mean it. Because when He shows you, you'll have to decide what to do with what you see.

Own Your Mistakes Out Loud

The second step is owning up to your mistakes and shortcomings directly. If you struggle to say "I'm sorry," it's time to start practicing. That phrase, along with "I was wrong" and "Will you forgive me?" might feel uncomfortable at first. But these are invitations the Lord brings us into because they're how we grow.

Saying "I was wrong" out loud does something to you. It breaks the cycle of self-protection and opens the door to real change. The discomfort is the point.

Ask the People Around You

The third step is asking the people you know and love for honest feedback. This means the people in your home, your workplace, and your closest relationships. It means genuinely wanting to know what it's like to be on the other side of you.

One of the healthiest practices for growth is what's called a 360 review, where people all around an organization simply get to offer feedback on your leadership. The goal is to understand how you actually come across, not just how you assume you do.

Because we do assume, don't we? We assume we're easy to work with. We assume people understand what we're saying the first time. We assume we're more present than we actually are. But assumptions aren't knowledge, and you can't fix what you haven't seen clearly.

The harder part of this step isn't asking for feedback. It's what comes next.

Listen, and Be Willing to Believe It

When feedback arrives, the instinct is to dismiss it. "That can't be right." "They don't understand the full picture." And sometimes that's true. But often it isn't.

Try this instead: pause, and ask yourself what the implications would be if they were 100% correct. If someone told you that you're on your phone too much, that you're not present with your family, what would you need to do differently if you actually believed them?

Those changes, if you made them, would be acts of courage and obedience. That's where the X might be marking the spot for you.

Tackle One Plank at a Time

The final step is the most practical one: don't try to fix everything at once. Personality assessments, honest feedback, and prayerful conviction can surface a long list of things to work on. Staring at that list will paralyze you.

Pick the one the Holy Spirit is pointing to most clearly, and work on that. Then the next one. The reality is, you're probably never going to run out of planks anyway. There will always be something else God wants to refine in your heart. But over time, the planks get smaller, and the self-awareness gets sharper.

Where to Start Today

Plank surgery isn't about self-condemnation. It's about growth. It's about becoming the kind of person your family, your coworkers, and your community actually experience as safe, honest, and present.

The Holy Spirit knows where to make the mark. The question is whether you'll sit still long enough to let Him show you, and then have the courage to do something about it.

Ask for that courage today. It's worth far more than $9,999.