Book excerpt: Philosophers and Religious Leaders provides a synopsis of the lives and legacies of 200 men and women from the areas of religion and philosophy who have "changed the world." These individuals have developed, extended, or exemplified ideas fundamental to the way human beings perceive the meaning and purpose of their own lives and of their societies. Some have challenged prevailing convictions and worked for immediate change during their lifetimes; others have proposed new modes of thinking that have flourished only after their passing.