The future seems a little gloomy! Go to bed early, sleep well, eat moderately at breakfast; the future looks brighter. The world's outlook may not have changed, but our capacity for dealing with it has. Happiness, or unhappiness, depends to some extent on external conditions, but also, and in most cases chiefly, on our own physical and mental powers. Some people would be discontented in Paradise, others... are cheerful in a graveyard.

Moods of Life: Popular Psychological Studies of Affairs of Every Day (ed. 1921)