Chennai: DMK chief M Karunanidhi has written a letter to PM-designate Narendra Modi lavishing praise on him for reaching the top through his "innate intelligence and hard work." PromotedListen to the latest songs, only on JioSaavn.comFollowing is the full text of his letter: Also ReadShiv Sena, BJP Leaders Exchange Barbs Over Mumbai-Goa HighwayPics: PM Modi's "Special" Raksha Bandhan Celebration With His "Young Friends"After Rahul Gandhi's Attack On Lateral Entry, BJP's "UPA's Time" Reminder