Honest Abe on Bulldogs

Hold on with a bulldog grip, and chew and choke as much as possible.
Abraham Lincoln

Presidents and pit bulls

"The greatest thing about him is cool persistency of purpose. He has the grip of a bulldog; when he once gets his teeth in, nothing can shake him off."

President Lincoln's impression of Ulysses S. Grant

Pushing to the front, or, Success under difficulties: a book of inspiration