“You don’t make up for your sins in the church. You do it in the streets. You do it at home. All the rest is bullshit and you know it.” So begins the voice-over by Martin Scorsese of his anxious and vital 1973 breakout, Mean Streets. More than four decades removed from its debut at the New York Film Festival, the film has remained an essential Scorsese blueprint, stocked with virtuoso camera work (Harvey Keitel’s drunken SnorriCam saunter), a killer soundtrack (“Be My Baby,” “Jumpin’ Jack Flash,” “Please Mr. Postman”), weighty themes (greed, guilt, the Madonna-whore complex), and pronounced cinematic influences (John Cassavetes, Samuel Fuller, Raoul Walsh — the film screens at BAM alongside several Walsh pictures).

Thu., March 13, 4:30, 7 & 9:30 p.m., 2014