The video “A Valuable Lesson For A Happier Life” uses a jar filled with golf balls, pebbles, and sand to illustrate the importance of setting priorities in life. The golf balls represent the most important things like family, health, and passions. The pebbles symbolize other important aspects such as work and home, while the sand stands for the small, less significant matters. The lesson is that if you fill your jar with sand first, there won’t be room for the golf balls or pebbles. This teaches us to focus on what truly matters and manage our time accordingly.