The notion of truth is not definable in any formal system that is strong enough to include arithmetic.
Profitability and purpose are not mutually exclusive—they are increasingly interdependent.
"The things that happen to you make you who you are."
"Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful."
Never underestimate the power of hard work and perseverance.