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FILE - In this April 27, 2014 file photo, Eric Clapton performs at the 2014 New Orleans Jazz & Heritage Festival at Fair Grounds Race Course in New Orleans. Clapton is sharing his grief over Prince's death, calling him “a true genius.” In a Facebook post Saturday, April 23, 2016, Clapton also tells how the artist inspired him to write the song "Holy Mother."(Photo by John Davisson/Invision/AP) Image Credit: John Davisson/Invision/AP

Eric Clapton is recalling Prince as a true genius and the inspiration for Clapton’s song Holy Mother.

In a Facebook post on Saturday, the rock and blues musician told of a dark time in his life in the 1980s that was eased by discovering Prince through the 1984 movie Purple Rain.

“I was out on the road in a massive downward spiral with drink and drugs, I saw Purple Rain in a cinema in Canada, I had no idea who he was, it was like a bolt of lightning!” Clapton wrote. “In the middle of my depression, and the dreadful state of the music culture at that time it gave me hope, he was like a light in the darkness.”

Returning to his hotel room and “surrounded by empty beer cans,” he recounted, Clapton wrote the song filled with both pain and faith.

“Holy Mother, where are you? Tonight I feel broken in two. I’ve seen the stars fall from the sky. Holy mother, can’t keep from crying,” the song begins. It ends with, “When my hands no longer play, my voice is still, I fade away. Holy mother, then I’ll be lying in, safe within your arms.”

On Facebook, Clapton wrote that he was “so sad about the death of Prince,” adding, “I can’t believe he’s gone.”

Prince, 57, was found dead on Thursday in his suburban Minneapolis home, with the cause of death unknown.