Life was simple before World War II. After that, we had systems.
Darkness cannot drive out darkness: only light can do that. Hate cannot drive out hate: only love can do that.
The universe is a book written in the language of mathematics, and physics is the key to deciphering its pages.
The customer's voice is the most important sound in any business.
Don't be afraid of failure when facing challenges. Every failure is a step towards success.