Being lucky enough to have the honor of meeting Uncle Ho twice, teacher Le Duc Duong is currently living in Germany. Although he is old, those unforgettable memories have left him with many thoughts about Uncle Ho's teachings on discipline in work and study. In the following years, the story of "living a useful life for society" has been told many times by him, not only to Vietnamese people but also to German friends who lived and worked with him in the following years.