Who encouraged Lennon and McCartney to write a song ?
McCartney said the song relates to someone like Maharishi Mahesh Yogi:Alistair Taylor , in the book " Yesterday " , reports a mysterious incident involving a man who inexplicably appeared near him and McCartney during a walk on Primrose Hill and then disappeared again , soon after McCartney and Taylor had conversed about the existence of God ; this allegedly prompted the writing of the song .