Dale Carnegie was a great admirer of President Abraham Lincoln. After reading many books written about the United States President he decided to write a short biography. Help Dale Carnegie Training Celebrate President Lincoln’s birthday. Join the Dale Carnegie Facebook page and share you favorite quote from Abraham Lincoln to be entered to win a prize. The winner of the contest will receive a copy of Dale Carnegie’s: “Lincoln The Unknown.” Share your favorite Abraham Lincoln quote and become eligible to win. The contest will come to an end on February 12th, President Lincolns 201st Birthday.