Science knows only one commandment - contribute to science. Bertolt Brecht
Journeys, like artists, are born and not made. A thousand differing circumstances contribute to them, few of them willed or determined by the will-whatever we may think. Lawrence Durrell
Both optimists and pessimists contribute to society. The optimist invents the aeroplane, the pessimist the parachute. George Bernard Shaw
Conservatives unwittingly side with the social forces that contribute to the destruction of traditional values. Christopher Lasch
Nothing would more contribute to make a man wise than to have always an enemy in his view. George Savile, 1st Marquess of Halifax
Gamblers do not contribute to the public welfare. Jewish Proverb