Such is the influence which the condition of our own thoughts, exercises, even over the appearance of external objects. Men who look on nature, and their fellow-men, and cry that all is dark and gloomy, are in the right; but the sombre colours are reflections from their own jaundiced eyes and hearts. The real hues are delicate, and need a clearer vision.
Charles Dickens (1839). “Oliver Twist”, p.256