The other night, I was sitting in bed reading a book I've owned for more than twenty years when I had something of a revelation.

It’s a little embarrassing, considering I've read the thing so many times that nearly every page is dog-eared and highlighted.

Some passages have handwritten notes beside them.

A few have both, presumably because I wanted to make absolutely certain my future self understood how profound I was finding them.

Apparently, he needed another twenty years.

The book is As a Man Thinketh, written by James Allen in 1903.

It's a short little volume that has influenced much of how I've come to think about life, responsibility, and the relationship between our thoughts and our circumstances.

I've recommended it to countless friends over the years.

As far as I know, none have read it.

Which is fine.

I have a few books on my own shelf that were recommended with equal enthusiasm by people I respect.

I'll get to them any day now.

But the other night, reading Allen's opening chapter for what must have been the fiftieth time, I suddenly wanted to jump out of bed and tell someone about it.

Guys. You have to read this.

As though I'd just discovered it.

Allen opens with an observation that is almost absurdly simple:

"A man is literally what he thinks, his character being the complete sum of all his thoughts."

He goes on to describe how our thinking influences our character, our actions, and ultimately much of the life we experience.

Now, I don't agree with every conclusion Allen draws.

Life is far too complicated, and circumstances far too unpredictable, to suggest that we think every good or terrible thing that happens to us into existence.

But his central observation is difficult to dismiss.

The thoughts we repeatedly entertain influence the choices we make.

Those choices become habits.

And over time, those habits help shape the circumstances of our lives.

None of this is particularly revolutionary.

In fact, most of us already know it.

Which raises an uncomfortable question.

If we know it, why do we so often live as though we don't?

For years, I understood Allen's philosophy intellectually.

I could explain it, recommend it, underline it, and apparently write little notes congratulating myself for understanding it.

But understanding something and living according to it are two very different accomplishments.

I knew the importance of discipline, preparation, and consistent effort.

Yet I spent years waiting for opportunities to arrive while neglecting much of the quiet work that would have brought them about.

More importantly, the work that would have prepared me to meet them.

I wanted to become an accomplished director, but I was often more comfortable cultivating relationships in the industry than sitting alone making imperfect little films.

I knew what I wanted.

I just hadn't fully appreciated how much of becoming that man would happen on ordinary Tuesdays when nobody was watching.

And when things didn't work out as I'd imagined, I was often more interested in examining my circumstances than the thinking and behavior that had helped create them.

It's remarkable how many intelligent men can be so spectacularly skilled at getting in their own way.

For a long time, I read Allen primarily through the lens of my mistakes.

His observations helped me understand how fear, avoidance, rationalization, and the pursuit of immediate comfort had influenced the direction of my life.

There was truth in that.

Some of it painful.

But the other night, something different happened.

I wasn't reading about how I'd arrived at a life I no longer wanted.

I was reading about the possibilities of creating the one I did.

And suddenly, the same words felt entirely new.

If my thinking had influenced so many of the decisions that led me somewhere I hadn't intended to go, then surely becoming more deliberate about my thinking will influence where I go next.

Not through affirmations, wishful thinking, or expecting the universe to deliver a new life to my doorstep.

Through action.

Through recognizing the stories I tell myself.

Questioning the ones that no longer serve me.

Making different choices.

Through doing the work.

Especially when I'm not particularly good at it yet.

Through understanding that a man's character isn't something he declares.

It's something he develops, largely in the ordinary moments of his life.

I knew all of this ten years ago.

Or at least I thought I did.

But now I've lived enough of the consequences, good and bad, to understand it differently.

The words hadn't changed.

The man reading them had.

I wonder how many of us are walking around carrying answers to questions we haven't quite learned how to ask.

How many things have we read, heard, or been told that we recognize as true but haven't yet incorporated into our lives?

We know we should take care of our bodies.

We know our relationships require attention.

We know that avoiding something difficult rarely makes it easier.

We know that the things worth doing generally require us to be willing to do them badly before we can do them well.

And yet knowing these things doesn't necessarily change how we live.

Sometimes it takes an experience.

Failure. Loss.

Or simply enough years for an old truth to finally make its way from our heads into our hands.

Into our daily lives.

I'm beginning to understand that wisdom isn't always something we acquire.

Sometimes it's something we gradually become capable of understanding.

And perhaps that's why it's worth returning to the books and ideas that once moved us.

Not because we failed to understand them the first time.

But because life may have given us new eyes with which to see them.

The other night, I closed a book I've been reading for more than ten years with the excitement of a man who'd just discovered something extraordinary.

It was a familiar idea.

One I'd been carrying around for years.

But for the first time, I wasn't simply looking backward, recognizing how my thinking had helped shape the life I'd lived.

I was looking forward, recognizing what I can do with that understanding now.

And at fifty-one, with considerably more life behind me than I once had, I found that prospect unexpectedly thrilling.

This begs the question. . .

What do you already know that you haven't yet learned how to live?

I suspect the answer may be worth more than the next ten books on your nightstand.