The memoir Evening Reflections - Nhớ nghĩ chiều hôm, with 30 chapters, encapsulates the turbulent life of Professor Dao Duy Anh, from his departure from Quang Binh and involvement in political activities to his dedicated career in teaching and researching the nation's history and culture at the Institute of History. This memoir conveys subjective truths about Professor Dao Duy Anh's thoughts and perspectives on various research issues, including theoretical aspects of historiography rarely found in other sources. The article clarifies his progressive views on historiography, the laws of historical movement, objectivity in historical research, methods for collecting and processing historical materials, and historiographical research methods as reflected in the memoir, which he authored over several years.