在数学中，提出问题的艺术必须比解决问题更有价值。
In mathematics, the art of proposing a question must be held of higher value than solving it.
It is a logically necessary truth that the future will resemble the past.
The only way to get through life is to laugh your way through it. You either have to laugh or cry. I prefer to laugh. Crying gives me a headache.
The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.