(Gaithersburg, Maryland-AP) -- Christian author and pastor Joshua Harris says he's never met the Reverend Billy Graham, who's celebrating his 85th birthday today. But the 29-year-old Harris says Billy Graham is one of his heroes. Harris, whose books on dating and courtship have sold more than a (m) million copies, praises Graham's example of moral integrity in an era when other preachers were falling into disgrace. Wishing Graham a happy birthday, he says, "I hope one day I'll be 85 and finishing strong." Joshua Harris's latest book is "Not Even a Hint: Guarding Your Heart Against Lust." He is also the author of "I Kissed Dating Goodbye."