What is the theme in The Jugurthine War by Sallust?

Corruption is the main theme. Sallust describes corruption as destroying Roman society. He blames it on an increasingly materialistic society, who value money over glory. Sallust claims the Roman's lives become so luxurious that their attitudes become complacent—particularly within the nobility who control the country. In the Conspiracy of Catiline, society is morally corrupt. The discipline that was in place, starting with the Roman army and seeping into society, has disappeared and in its place are individuals all looking to live for the moment.