In The Key Traits of Abraham Lincoln: A Study in Ethics, with an Epilogue Addressed to Theologians, author Clark S. Beardslee reveals to the reader a portrait of the 16th President of the United States of America in terms of his moral qualities and ethical principles. With the help of objective analysis and deep understanding, the book reflects important aspects of Lincoln's character, his wisdom in decision-making, justice in actions and solidarity in relations with people around him. The epilogue, addressed to theologians, opens new dimensions in the understanding of moral principles and their use in politics and society. The book serves not only as a source of knowledge about Abraham Lincoln, but also as a literary field for discussing ethical issues and choices faced by great figures of the past. With the author's stylish writing and detailed research, "Key Traits of Abraham Lincoln" becomes a valuable addition to the literature of ethics and biographical studies, opening new levels of understanding of the moral virtues of the legendary politician.