President Herbert Hoover, on the Lessons to be Drawn from Abraham Lincoln's Life

If Washington was the nation's father, Hoover once said, than Lincoln was its greatest son. Here he tells a Lincoln biographer that,

Perhaps the most impressive lesson to be drawn from the life and sayings of Abraham Lincoln is that battles that are won in hate but provoke later conflicts, whilst those that are won by love leave no sting and are therefore permanent victories.
 
It was into Lincoln’s study, in fact, that Hoover fled when he crashed upon the rocky shoals of the Depression: perhaps running his re-election campaign from the room where Lincoln gazed, daily, at the rebel flag flying across the Potomac, gave him hope.