“The happiness of a man in this life does not consist in the absence but in the mastery of his passions.”

“It's not what happens to you, but how you react to it that matters.”

“The happiness which is lacking makes one think even the happiness one has unbearable.”

“Happiness is the interval between periods of unhappiness.”

“Happiness... consists in giving, and in serving others.”

“Every gift from a friend is a wish for your happiness.”

“Satisfaction of one's curiosity is one of the greatest sources of happiness in life.”