There is a reason I have begun building a glossary on Fireproof Commentaries. It is not merely to organize a website or add another resource page. It grows out of a conviction that has only strengthened with time: words matter, and confusion often begins where language becomes careless.

Many disagreements are not first disagreements of fact, but disagreements of meaning. People use the same vocabulary while attaching different definitions to it. They speak with confidence, hear with confidence, and yet never truly meet in understanding. Shared words can create the illusion of shared belief.

This problem exists in every field of life. In law, unclear language harms justice. In medicine, it harms bodies. In engineering, it harms structures. In family life, it harms trust. And in theology, careless language harms souls.

I have seen this many times, but one example has stayed with me.

Years ago, I had lunch with a pastor from the ELCA. We had a warm and thoughtful conversation, and for a while it seemed we agreed on nearly everything. We spoke of grace, faith, salvation, the church, and Christ with great harmony. But then we began defining our terms.

That was the turning point.

As we clarified what we each meant by the words we were using, real distinctions began to emerge. Some agreements proved genuine. Others had existed mainly in vocabulary. Yet the conversation remained fruitful, and the friendship remained strong. In fact, clarity improved the discussion rather than harming it.

That experience confirmed something important to me: precision is not the enemy of charity. Confusion is.

Many assume careful definitions create division. Often the opposite is true. Undefined language creates shallow agreement, hidden misunderstandings, and conversations that sound meaningful while communicating very little. Clear definitions may reveal differences, but they also reveal where true agreement actually exists. Honest understanding is better than pleasant ambiguity.

This concern is especially urgent in Christian communication.

Much modern religious speech uses biblical words while abandoning biblical meaning. Faith may be reduced to optimism. Grace may be treated as permission. Repentance may mean regret. Peace may mean comfort. Worship may mean atmosphere. Salvation may mean self-improvement. The language remains familiar, but the substance has changed.

That is dangerous, because error rarely arrives announcing itself openly. It often borrows honored words and quietly fills them with foreign meaning.

Scripture teaches us to treat words seriously.

God created through speech. He revealed Himself through speech. He gave His truth in words. And in one of the highest declarations in all the Bible, He identifies His Son as the Word.

That title is not accidental. Christ is the perfect revelation of God—the living expression of the Father. If God so honors meaningful communication that He calls His Son the Word, then Christians should not handle language carelessly.

That is why I am building this glossary.

Some terms need rescuing from confusion. Some need restoring to biblical weight. Some need separating from modern substitutes. Some need sharpening again after years of misuse.

If readers better understand faith, grace, repentance, church, justification, truth, worship, or rest because of this effort, then the work is worthwhile.

Precision in language does not save anyone. Christ saves.

But clear words help us speak truthfully about the Christ who saves.

And in a confused age, that is no small thing.