Youth would be an ideal state if it came a little later in life.
I'll be more enthusiastic about encouraging thinking outside the box when there's evidence of any thinking going on inside it.
I have enjoyed greatly the second blooming... suddenly you find - at the age of 50, say - that a whole new life has opened before you.
Beginning today, treat everyone you meet as if they were going to be dead by midnight. Extend them all the care, kindness and understanding you can muster. Your life will never be the same again.
The knowledge of the world is only to be acquired in the world, and not in a closet.
Flattery is like cologne water, to be smelt of, not swallowed.
Sometimes when you innovate, you make mistakes. It is best to admit them quickly, and get on with improving your other innovations.