1. The question behind the words

I started with a question many people ask sooner or later: what am I made of? When the Bible speaks of my soul and my spirit, is it naming two different things inside me, or one thing by two names? Am I two parts or three?

It is a good question, and I spent a long time on it. I no longer think it is the question the Bible is most interested in answering.

When I slowed down and read every verse where Scripture uses its words for the inside of a person — heart, soul, spirit, flesh, conscience, the bosom — I found something different from what I expected. There were close to 2,700 such verses. The Bible does not lay these words out like parts on a workbench. It does not define them, number them or rank them. It uses them the way we use words for things we live with every day: freely, overlapping, moving from one to another in the same breath. "My soul yearns for you in the night; my spirit within me earnestly seeks you" (Isaiah 26:9). Is that two things or one? The verse does not stop to say. It is too busy seeking God.

What the Bible does say, again and again, is how the inside of a person works. It shows me a heart that speaks to itself, plans, hides, hardens and breaks. It shows a soul that thirsts, grows bitter, is hunted, is rescued and is spoken to. It shows a spirit that is stirred, crushed, revived and ruled. It shows flesh that trembles and faints and sings. And it shows God, other people, words, food, sights and news reaching into all of this and moving it.

So the question I now ask is this:

How does the inner being work, as Scripture itself describes it?

By "inner being" I mean the part of a person no one can see: how we think, feel, choose, relate to others, and turn ourselves toward meaning and toward God. Scripture's own phrase for it is "the hidden person of the heart" (1 Peter 3:4).

What I found does not fit a neat count of parts. The words really do overlap, and they really do come apart at a few places, most of all at death. The heart is far larger than a count of parts allows. Flesh, conscience and the bosom have their own things to say. And the whole inner life is busy, exposed and moving in a way a parts-list cannot show.

How I have read

I have tried to let the verses speak first. Where I give my own reading of a passage, I try to say so. Where Scripture is silent, I try to leave it silent rather than fill the gap. I quote the ESV, and where a point depends on the Hebrew or Greek, I say that too. Where I give numbers, they are only there to show how much ground the words cover. This is not a statistical study.

The shape of what follows

Chapter 2 follows life, breath and death: where life comes from, and what happens to each part when it ends.
Chapter 3 looks at how the words relate: one inner person, spoken of from several sides.
Chapters 4 to 8 take each word in turn: the heart, the soul, the spirit, flesh, and then conscience and the bosom.
Chapter 9 looks at the places where Scripture does draw the words apart.
Chapter 10 shows the inner being at work. It opens with how the activities work together, following one path from a thought to a deed. Then it takes each activity in turn: feeling, knowing and hearing, remembering and forgetting, thinking, speaking, wanting, choosing, right and wrong, relating to God and relating to others.
Chapter 11 gathers the patterns that run through all of it. The inner being is acted on as much as it acts. It crosses thresholds. Its parts give way in sequence. Its states pass between people. And the same word, or the same activity, changes character with its circumstances.
Chapter 12 turns to what goes wrong.
Chapter 13 follows the inner being under God's anger: how it is provoked, pleaded against, read, borne, and turned from.
Chapter 14 turns to how it is made new.
Chapter 15 looks past the named words, to the large part of inner life that Scripture describes without naming heart, soul or spirit at all.

"I praise you, for I am fearfully and wonderfully made" (Psalm 139:14). I no longer read that as a claim about how many parts I have. I read it as praise for how I am made.