This paper explains that Aquinas's work, "De Malo," examines the issue of evil from both the theological and the philosophical angles of interest and states that its focus is to ascribe meaning to the concept of evil.
From the Paper:
"The moniker St. Thomas Aquinas evokes the image of a master theologian and a brilliant philosopher. Inspired by St. Augustine's dogma and Aristotelian theories, St. Thomas Aquinas quickly attained status as a master logician in his own right. His literature has stood the test of time, offering tremendous insight into the age-old question: what is the nature of evil?"
St. Thomas Aquinas's "De Malo" (2012, January 15). Retrieved February 12, 2012, from http://www.academon.com/Analytical-Essay-St-Thomas-Aquinas's-De-Malo/58404