“Re-examine all you have been told at school or church or in any book, dismiss whatever insults your own soul,” Walt Whitman (May 31, 1819–March 26, 1892) wrote in offering his timeless advice on living a vibrant and rewarding life in the preface to Leaves of Grass. When Whitman first published his masterpiece in 1855, it was met with indifference punctuated by bursts of harsh criticism. It is difficult to imagine just how insulting to the young poet’s soul such reception must have been, or what it took for him to dismiss it and carry on writing. What buoyed his spirit through the tidal wave of negativity was an extraordinary letter of appreciation from Ralph Waldo Emerson — the era’s most respected literary tastemaker and Whitman’s greatest hero, whose 1844 essay The Poet had inspired Leaves of Grass. The young poet wore Emerson’s praise of “incomparable things said incomparably well” like an armor, almost literally — he carried the letter folded in his shirt-pocket over his heart, regularly reading it to friends and lovers.