Tom Hanks has finally put words to the thing he has been circling for more than two decades, and the words landed with the weight of a man who has never quite finished grieving.

In a rare and emotionally unguarded reflection on his time making The Green Mile, Hanks stopped mid-sentence while discussing his late co-star Michael Clarke Duncan, collected himself, and delivered what may be the most honest sentence of his public life.

“Michael Clarke Duncan was not acting,” Hanks said. “He was being.”

That single line, delivered years after the film’s 1999 release and revisited repeatedly in the years since Duncan’s death in 2012, has become the definitive statement on a performance that changed both men and continues to find new audiences a quarter century later.

Hanks, now 68 and a two-time Academy Award winner, has spoken generously about nearly every collaborator across a 40-year career. But the way he speaks about Duncan carries a different quality entirely, a gratitude that seems to reach past the professional into something closer to awe.

The Green Mile was not an easy film to make. Frank Darabont’s three-hour adaptation of Stephen King’s serial novel asked audiences to believe in miracles, to sit with the machinery of execution, and to surrender emotionally to a story about a gentle giant on death row. It got everything it asked for.

Duncan was 31 when he auditioned for the role of John Coffey. He had grown up on Chicago’s South Side, the son of a single mother who worked multiple jobs. He dug ditches.

He worked as a bouncer. He served as a bodyguard for Will Smith and Martin Lawrence, watching movie sets from the perimeter while the work he could not yet imagine happened in front of him.

His early acting parts required him to stand in doorways and look threatening. By any reasonable accounting, that was where his relationship with Hollywood was going to stay. His manager pushed him to audition for The Green Mile.

Duncan did not believe he was actor enough for something so complex.

He auditioned anyway. He delivered a monologue. The room went quiet in the specific way rooms go quiet when something unexpected has just occurred.

Darabont knew immediately. Hanks, already attached to the film, agreed completely.

What nobody outside the production understood yet was that Duncan brought no technique to the role. He had never learned to manage the instrument the way trained actors do, the controlled distance, the ability to go somewhere emotionally and return on schedule. When the scene required grief, he grieved.

When it required terror, he was terrified.

When John Coffey told Paul Edgecombe he was tired, tired of people being ugly to each other, Michael Clarke Duncan was tired. The exhaustion was not performed. It was present in the body, in the eyes, in the stillness of a man who had genuinely used himself up.

Hanks has said watching that changed how he thought about acting. For a man with two Oscars and four decades of accumulated craft, that admission carries particular humility, the recognition that someone with almost no training had found a door formal training never showed him.

On set, Hanks became a mentor not by appointment but by presence. Duncan was terrified. Hanks was the person with the most experience and the least ego about deploying it for someone else’s benefit.

Between takes, when Duncan doubted himself, Hanks was simply there, treating a first-timer as a peer.

The production itself was built to break people down. Production designer Terrence Marsh constructed the mile with historical precision, down to the shade of green linoleum used in Southern prisons of the era. The lighting grew more oppressive the further down the corridor you walked.

Darabont gave the cast an afternoon before filming began to simply occupy their positions in complete silence for hours. Not a rehearsal. An immersion.

By the time cameras rolled, the set was not a construction. It was a place that had been lived in.

The execution sequences were shot with multiple cameras to minimize takes because the practical effects were expensive and the emotional toll was severe. Sam Rockwell, who played the volatile Wild Bill Wharton, has described the atmosphere of those days as something the cast carried home with them.

The film earned $136 million on a $60 million budget, respectable but not spectacular. Then something happened that happens to very few films. It kept going, through home video, through cable, through the word of mouth that attaches itself to stories people feel compelled to share with someone they love.

The Green Mile became one of the most watched films in American television history. It is the kind of movie that finds people at the right moment, that stops them from changing the channel at midnight, that they watch again even knowing what happens, even knowing it will cost them, because the cost is part of why it matters.

Duncan received an Academy Award nomination for Best Supporting Actor, the first actor with so limited a prior resume to earn that recognition for a first major role. He did not win. Michael Caine won that year for The Cider House Rules.

But the nomination transformed his life.

He went on to appear in Planet of the Apes, The Whole Nine Yards, The Scorpion King, and Daredevil. He voiced characters in animated films and video games. He was funny and warm in interviews, a man whose physical enormity was constantly upended by the gentleness he carried inside it.

What those who knew him on set have said consistently is that the man who showed up every morning was the same man who appeared on screen. Gentle, genuine, slightly bewildered by where he found himself, unwilling to perform being anything other than what he was.

Hanks has noted that Duncan’s size made every room rearrange itself around him, but that Duncan never used that fact for anything. He held his body carefully, with a consideration for other people that is not how men of that size are expected to move through the world.

He was 54 years old and still learning what his career could become. He had found, late and improbably, the thing he was made for. And then it was over.

Duncan died on September 3, 2012, in Los Angeles. He had suffered a heart attack in July and never recovered. The career that began so improbably lasted 13 years from the moment Darabont’s audition room went quiet.

He was not old. There was more to do.

Hanks was among those who spoke after Duncan’s death. He said Duncan was a man of tremendous strength and gentle kindness. He said the world was a better place for his having been in it.

He said he would miss him greatly.

These are not unusual things to say about someone who has died. What makes them unusual is the register in which Hanks says them. Not the polished grief of a professional tribute, but the plainspoken inadequacy of a man who has run out of language for what he actually feels.

Hanks has been publicly articulate about most things in his life. The Green Mile and the man who made it what it was is one of the subjects where the articulation breaks down. Where he stops mid-sentence.

Where he looks for the word and the word is not there.

That gap between what he knows and what language can hold is itself a kind of tribute. Some things are too real to be said cleanly. You circle them instead.

You come back again and again across the years, each time with slightly different words, each time arriving at the same place.

This man showed me something I did not know the work could do, and he is gone, and I am still grateful, and I am still not finished being grateful.

That is what Hanks has been saying in various forms for 25 years. That he was in the room when something true happened. That the man who made it happen is gone.

That the truest thing he knows how to say about it is that Michael Clarke Duncan was not acting.

He was being. And some things, once you have seen them, stay with you for exactly as long as you do.