Joel Edgerton, Oscar Isaac and Ethan Hawke explain how they worked with the writer-director, known for solitary characters grappling with sin and redemption.The writer-director Paul Schrader has a metaphor he likes to use with his leading men.In his view, actors tend to think of themselves as trees in the wind fighting to stay upright when they perform. But Schrader tells his stars, “Get that image out of your head and replace it with the image of a cliff on a seacoast. And you’re there and the waves are pounding against you. They are going to come and they are going to hit you and then they are going to go away.” In this metaphor the waves can be day players sharing a scene or plot points in a narrative. But no matter what crashes against them, these men must remain stoic, hardened against the world.Joel Edgerton heard a version of this from Schrader in their first conversation about “Master Gardener,” which opened Friday. The drama is the final installment in Schrader’s recent and lauded “Man in a Room” trilogy, which began in 2017 with “First Reformed,” starring Ethan Hawke, and includes “The Card Counter” (2021), starring Oscar Isaac.“I think I probably got the same speech that Ethan got and the same speech that Oscar got,” Edgerton said, explaining, “It wasn’t the place for an actor to explore their bag of tricks and create flourish within character but rather reduce themselves to sort of a conduit of stillness to everything moving and swirling around them.”And, indeed, Isaac and Hawke both have their own descriptions of similar dialogues with Schrader. In interviews, the actors who played these proverbial men in rooms explained what it was like to inhabit tortured but oddly serene personas in works that grapple with typical Shrader questions of sin and redemption.“Master Gardener” casts Edgerton as Narvel Roth, a horticulturist who harbors a disturbing secret: He’s a former white nationalist in witness protection. Underneath his turtleneck and overalls, his body is covered in racist tattoos. In “The Card Counter,” Isaac is William Tell, a proficient gambler who was once an Abu Ghraib torturer. And in “First Reformed,” Hawke is the Rev. Ernst Toller, a holy man filled with despair over climate change.Oscar Isaac in “The Card Counter.” Though Schrader specializes in bleak tales, “he’s not a nihilist,” the actor said. Courtesy Of Focus Features/Focus Features, via Associated PressAll three write in journals, and their entries, offering windows into their preoccupations, are delivered in voice-over narration. These beats are part of the language of a Schrader movie. “It’s like his version of a sonnet,” Isaac said. “He has his forms that he likes to use to explore different things.”In these films Schrader echoes both the French filmmaker Robert Bresson, with deliberate references to “Pickpocket” and “Diary of a Country Priest,” and himself. Travis Bickle (Robert De Niro) scribbled in one of these notebooks in Martin Scorsese’s “Taxi Driver” (1976), which Schrader wrote. So did Willem Dafoe’s drug dealer in “Light Sleeper” (1992), which Schrader wrote and directed.“Even when you’re shooting it, you’re aware there’s a meta thing happening where you realize like, right, this is like Travis Bickle, this is like Willem,” Hawke said. “You feel like, right, I’m part of this lineage of this human being’s work.”It’s work that Hawke is happy Schrader, now 76, is continuing. “I had the feeling that when we finished ‘First Reformed’ — he never said this to me, it was just a feeling — that he might not make another movie,” Hawke said.When Hawke saw “The Card Counter,” he said, he was proud of Schrader for “going back to war.”Schrader didn’t set out to write a trilogy, and only after someone suggested it as such did he acknowledge that’s what he was doing. All three movies concern troubled men reaching for forgiveness and transcendence, and all three trade in metaphors. “‘First Reformed’ really is not about global warming and ‘Card Counter’ is not about gambling and this one really isn’t about racism or gardening,” he said over coffee at the senior-living apartment complex in Hudson Yards where he now lives. “It’s about evolution of the soul of these people who are locked off in their rooms and can’t reach out and touch anyone.”These dramas not only ask their stars to wrestle with the misdeeds and troubles of their characters, but also require them to operate within Schrader’s precise style. He said he cast performers both on instinct and on a sense of whether they can “hold the mystery.”“There were several very important conversations that happened really early on about the value of withholding, a willingness to ask the audience to work with us, to not tap dance and try to entertain them, to not reveal too much, to invite mystery,” Hawke said, explaining that there is a freedom in that direction.Ethan Hawke as a troubled pastor in “First Reformed.” The actor said he and Schrader had “several very important conversations that happened really early on about the value of withholding.”A24At the same time, there is difficulty in achieving the stillness that Schrader asks. “In some ways it was like being asked to go to work with a straitjacket on,” Edgerton said. “But I didn’t feel like that was too daunting a proposition. My feeling always is that the director is captain, and if you go to work with someone, you put yourself in their capable hands.”Recognizing the internality Schrader was asking him to portray, Isaac recruited one of his teachers from Juilliard, Moni Yakim, and did mask work. “I was like, well, my face is going to literally be a mask, so how can I tell the story just through the body and through energy,” Isaac said.And then there’s the writing. Schrader asked each actor to copy out his character’s journal in his own hand. Isaac believed that William would write in cursive, so he took a penmanship course. For Edgerton the task was in line with his usual approach: “I always want my own handwriting to be my own handwriting” onscreen, he said, even before “Master Gardener.” All described the process as meditative, in a way.“You know in Acting 101 they tell you to write your character’s biography, try to write a journal in character,” Hawke said. “Those are very challenging exercises to do that help find the voice of the character and help integrate yourself with the person. For me it was literally delivered to me in a box with an assignment of what to do, so I loved it.”Isaac noted that Schrader, for all of his hard edges and tough themes, has a soft side as well. While “Master Gardener” ends in a different way, a number of Schrader’s films, including “The Card Counter” and “Light Sleeper,” conclude with the hero in prison reaching out to a woman he loves. “He believes in the truth and purity of what love is and what love can do,” Isaac said. “So no matter how dark and grueling things can get, he has that spark in him, too. He’s not a nihilist.”Edgerton has not yet had the opportunity to discuss his time in Schraderland with Hawke or Isaac, but the latter two have swapped stories. Schrader pulled out his phone to show me a photo he received of them alongside another one of his actors, Dafoe, huddled together with middle fingers raised. He suggested it should accompany this article.Hawke and Isaac worked together on a Marvel Cinematic Universe television show, “Moon Knight,” but Isaac, in conversation, thought of another potential franchise. “It’s an incredible badge of honor to be part of Paul Schrader’s extended universe, the PCU,” he said, laughing. “It’d be one hell of a convention of all those characters coming together. We could do a team movie. I’m going to pitch him on that.” More