Scarcity of information can present a difficulty for writing a biography. Abundance of information can do the same. As perspectives multiply, a subject sometimes becomes clearer; other times it becomes complicated. In Islamic studies, for example, the more sources that are uncovered on central historical figures such as the Prophet Muhammad, al-Hasan al-Basri, and al-Ghazzali, the more scholars are in dispute over their biographies. Yet historical figures of the second degree—those individuals whose biography has not yet attracted a separate study but who are studied for their role in larger questions—are often portrayed with deceptive simplicity. Scholars tend to stick to the most coherent and simple biography and move on to the question at hand. Such coherence and simplicity, however, often is not found in the sources.