“If you think you can you can, if you think you can't you're right!”

“If you once forfeit the confidence of your fellow citizens, you can never regain their respect and esteem. It is true that you may fool all of the people some of the time; you can even fool some of the people all of the time; but you can't fool all of the people all of the time. -Speech at Clinton, Illinois, September 8, 1854.”

“You can have anything you want if you want it badly enough. You can be anything you want to be, do anything you set out to accomplish if you hold to that desire with singleness of purpose.”

“You can fool some of the people all of the time, and all of the people some of the time, but you can not fool all of the people all of the time.”

“I know not how to aid you, save in the assurance of one of mature age, and much severe experience, that you can not fail, if you resolutely determine, that you will not.”

“You can tell the greatness of a man by what makes him angry”

“Take all that you can of this book upon reason, and the balance on faith, and you will live and die a happier man. (When a skeptic expressed surprise to see him reading a Bible)”