"Gratitude can shift your perspective, elevate your mood, and contribute to your goodness."
"Both optimists and pessimists contribute to society. The optimist invents the aeroplane, the pessimist the parachute."
"Everyone has to contribute, or they become laborers."
"Many hands and hearts and minds generally contribute to anyone's notable achievements."
"One of the consequences of such notions as ‘entitlements’ is that people who have contributed nothing to society feel that society owes them something, apparently just for being nice enough to grace us with their presence."
"When you cease to make a contribution, you begin to die."