Greatness is not about being the best, it's about being better than you were yesterday.
You will never be happy if you continue to search for what happiness consists of. You will never live if you are looking for the meaning of life.
We're not going to run out of ammunition.
Choose rather to be strong of soul than strong of body.
The greatest happiness is to know the source of unhappiness.
We must balance the need for energy with the need to protect our planet.