8. Avoid wasting time planning for the future.

Everyone hustles his life along, and is troubled by a longing for the future and weariness of the present. But the man who … organizes every day as though it were his last, neither longs for nor fears the next day.

Often we postpone our happiness until the future, but Seneca argues that ironically this “future” we obsess about doesn’t exist—only the present does.

If instead, we plan and live each day as if it were our last, we can better enjoy today and prepare for tomorrow.