"La historia del mundo no es el terreno de la felicidad. Los períodos de felicidad son las páginas en blanco de la historia."

Simplified Meaning:

World history often highlights big events, conflicts, and wars rather than peaceful and happy times. When people are content and nothing dramatic is happening, there's usually not much to write about and those times are often forgotten. Imagine a history book filled with stories of battles, discoveries, and upheaval, but completely quiet during calm and joyful times. For instance, during times of peace in a country, people live their daily lives without much disruption, so those times don't make headlines. This idea suggests that history is shaped more by turmoil and change than by stable, happy periods. If you want to apply this wisdom, appreciate and make the most of the quiet, happy moments in your life even if they don't seem significant, because they're valuable even if they aren't dramatic enough to make history.