Having a bad day? Perhaps it's all for the best. In an interview that appears in An Artist Observed: 28 Interviews with Contemporary Artists, The late Francis Bacon, considered Britain’s greatest living painter at the time of the interview in 1972 made this provocative observation:
But I feel ever so strongly that an artist must learn to be nourished by his passions and by his despairs. These things alter an artist whether for the good or for the better or the worse. It must alter him. The feelings of desperation and unhappiness are more useful to an artist than the feeling of contentment, because desperation and unhappiness stretch your whole sensibility.
[thanks Brain Pickings]