Take a two-mile walk every morning before breakfast.
I'd never looked down the barrel of a gun before, but everything you've heard about the experience is true.
Experience is that marvelous thing that enables you to recognize a mistake when you make it again.
History is more or less bunk.
Never make a defense or an apology until you are accused.
Never hold discussions with the monkey when the organ grinder is in the room.
The power of accurate observation is commonly called cynicism by those who have not got it.