Wild at Heart : Discovering the Secret of a Man's Soul by John Eldredge Wild at Heart Expanded Edition: Discovering the Secret of a Man's Soul Wild at Heart: Discovering the Secret of a Man's Soul Wild at Heart: Discovering the Secret of a Man's Soul: Eldredge, John Wild at Heart : Discovering the Secret of a Man's Soul by John Eldredge. John Eldredge argues that God designed men with a longing for adventure, courage, and purpose. He suggests many men suppress these desires under cultural pressures, and offers guidance on reclaiming authentic masculinity and living bravely with meaning.