Cardinal Mercier’s Manual of Modern Scholastic Philosophy is a standard work, prepared at the Higher Institute of Philosophy, Louvain, mainly for the use of clerical students in Catholic Seminaries. Though undoubtedly elementary, it contains a clear, simple, and methodological exposition of the principles and problems of every department of philosophy, and its appeal is not to any particular class, but broadly human and universal. Volume II contains sections on natural theology, logic, ethics and outlines of the history of philosophy.

Vols. 2 and 5 include appendices.

"Theodicy" is a book of philosophy by the German polymath Gottfried Leibniz published in 1710, whose optimistic approach to the problem of evil is thought to have inspired Voltaire's "Candide". Much of the work consists of a response to the ideas of the French philosopher Pierre Bayle, with whom Leibniz carried on a debate for many years. The "Theodicy" tries to justify the apparent imperfections of the world by claiming that it is optimal among all possible worlds. It must be the best possible and most balanced world, because it was created by an all powerful and all knowing God, who would not choose to create an imperfect world if a better world could be known to him or possible to exist. In effect, apparent flaws that can be identified in this world must exist in every possible world, because otherwise God would have chosen to create the world that excluded those flaws. Leibniz distinguishes three forms of evil: moral, physical, and metaphysical. Moral evil is sin, physical evil is pain, and metaphysical evil is limitation. God permits moral and physical evil for the sake of greater goods, and metaphysical evil is unavoidable since any created universe must necessarily fall short of God's absolute perfection.

This book is a systematic introduction to moral philosophy (or as it is also called: ethics) that aims at raising its readers’ ethical literacy and competence. Starting from the nature and end of this science it examines the fundamental questions and concepts of ethics. The core chapters familiarise the reader with the elements of a human act, outline how these elements influence the ethical quality of such act and shed light on the standard of morality, i.e. the good. The book furthermore clarifies the concepts of duty, right as well as responsibility and explicates the moral duties and rights of the human person. In doing so it also elucidates the notions of human dignity and the common good. Last but not least, the book contains a range of practical tools that help the reader put ethical theory into practice. The comprehensive appendix contains chapters on the virtues, propositional logic and arguments.