Happy is the person who knows what to remember of the past, what to enjoy in the present, and what to plan for in the future.

The quote proposes happiness as an art of time-management in the emotional sense: memory, attention, and foresight each have their proper role. “What to remember” implies selective recollection—learning from the past without being trapped by regret or nostalgia. “What to enjoy” elevates present-mindedness, suggesting that well-being depends on noticing and savoring what is available now. “What to plan” frames the future as something to prepare for rather than fear, emphasizing agency and prudence. The triadic structure (past/present/future) turns happiness into a disciplined balance: integrate experience, inhabit the moment, and act with intention toward what comes next.