According to McCartney, this is a very positive song, owing to its inspiration. One night when he was paranoid and anxious, he had a dream where he saw his mother, who had been dead for ten years or so - she came to him in his time of trouble, speaking words of wisdom that brought him much peace when he needed it. It was this sweet dream that got him to begin writing the song.
He told the story to James Corden when he appeared on his Carpool Karaoke segment
. "She was reassuring me, saying, 'It's going to be OK, just let it be.' I felt so great. She gave me the positive words. I woke up and thought, 'What was that? She said 'Let It Be.' That's good.' So I wrote the song 'Let It Be' out of positivity."
Many have been moved by the song on a deeply personal level, including Corden, who broke down when they sang it together. "I remember my granddad, who was a musician, sitting me down and telling me, 'I'm going to play you the best song you've ever heard,' and he played me that," he said. "If my granddad was here right now he'd get an absolute kick out of this." McCartney replied, "He is."