At the age of 20, Søren Kierkegaard began writing his diary that he maintained until his death. In it we find a tour of the main events of his life, we enter into some readings that shaped his reflections, the building of his own thinking. His diary is also a critical analysis of his time, in which many people are judged from the public life of his hometown and other parts of Europe; is a passionate and poignant testimony of his love for Regina Olsen, and an interesting reflection on the responsibility of being a writer. In this volume the final years of his university life are collected, until 1837, the year in which he met Olsen. This period has a special hermeneutic relevance to know the genesis of Kierkegaard's thought.