In the story "Alatriste" by Arturo Pérez-Reverte, the protagonist reflects on the fleeting nature of time. The quote "Yesterday he left, tomorrow has not arrived" captures the essence of living in the present moment, emphasizing how the past is gone and the future remains uncertain. This idea resonates throughout the narrative, showcasing the importance of valuing the present rather than being burdened by regrets or anxieties about what lies ahead.

The quote underlines a central theme in the book: the transient experiences that shape our lives. It serves as a reminder that life is a series of moments that should be embraced as they come, rather than dwelling on what has passed or worrying about what is to come. This philosophical perspective enriches the characters' journeys, encouraging readers to appreciate their own lives and the present circumstances in which they find themselves.