De Brevitate Vitae (English: On the Shortness of Life) is a moral essay written by Seneca the Younger, a Roman Stoic philosopher, sometime around the year 49 AD, to Paulinus. Seneca's biting words still pack a powerful punch two thousand years later. According to the essay, nature gives people enough time to do what is really important and the individual must allot it properly. In general, time is best used by living in the present moment in pursuit of the intentional, purposeful life.
This is a rare treat for students of Stoicism and for anyone interested in seeking an answer to the eternal question, "How should I best use my time?"