With respect to the moral government of the world, the humanists seldom get beyond a cold and resigned consideration of the prevalent violence and misrule. In this mood the main works 'On Fate,' or whatever name they bear, are written. They tell of the turning of the wheel of Fortune, and of the instability of earthly, especially political, things. Providence is only brought in because the writers would still be ashamed of undisguised fatalism, of the avowal of their ignorance, or of useless complaints. Gioviano Pontano ingeniously illustrates the nature of that mysterious something which men call Fortune by a hundred incidents, most of which belonged to his own experience. The subject is treated more humorously by Aeneas Sylvius, in the form of a vision seen in a dream. The aim of Poggio, on the other hand, in a work written in his old age, is to represent the world as a vale of tears, and to fix the happiness of various classes as low as possible. This tone became in future the prevalent one. Distinguished men drew up a debit and credit of the happiness and unhappiness of their lives, and generally found that the latter outweighed the former. The fate of Italy and the Italians, so far as it could be told in the year 1510, has been described with dignity and almost elegiac pathos by Tristan Caracciolo. Applying this general tone of feeling to the humanists themselves, Pierio Valeriano afterwards composed his famous treatise. Some of these themes, such as the fortunes of Leo X, were most suggestive. All the good that can be said of him politically has been briefly and admirably summed up by Francesco Vettori; the picture of Leo's pleasures is given by Paolo Giovio and in the anonymous biography; and the shadows which attended his prosperity are drawn with inexorable truth by the same Pierio Valeriano.