"The purpose of life is to live it, to taste experience to the utmost, to reach out eagerly and without fear for newer and richer experience."

"Go wisely and slowly. Those who rush stumble and fall."

"No pessimist ever discovered the secret of the stars or sailed an uncharted land, or opened a new doorway for the human spirit."

"If I regarded my life from the point of view of the pessimist, I should be undone."

"Both optimists and pessimists contribute to society. The optimist invents the aeroplane, the pessimist the parachute."

"If someone betrays you once, it’s their fault; if they betray you twice, it’s your fault."