Cardinal Gianfranco Ravasi has paid tribute to the late rock 'n roll icon Lou Reed in a series of tweets. Cardinal Ravasi, the head of the Vatican's culture ministry, commemorated the singer by quoting a verse from his song Perfect Day. Cardinal Ravasi, whose twitter name is @cardravasi, wrote: "Oh, it's such a perfect day, I'm glad I spend it with you, Oh, such a perfect day, You just keep me hanging on (Lou Reed)". The cardinal followed this initial tweet with a passage from the bible which included a further quotation from the song: "Be under no illusion: God will not be fooled. You're going to reap just what you sow (Galatians 6,7 and Lou Reed in Perfect Day)". Cardinal Ravasi's tribute was one of many that poured in after Reed's death on Sunday, with his friend and collaborator David Bowie describing him as "a master". Reed, the lead singer of the influential rock group The Velvet Underground died at the age of 71. According to reports, his death was caused by liver disease. Reed underwent liver transplant surgery earlier this year.