To be happy we need continuous growth. The best way to grow is life-long education. This doesn't mean you need to pursue a doctorate or spend 2 hours reading every day. Self education can be anything that takes you out of your comfort zone. The important part is keeping an open mind and searching for fresh ideas and perspectives.
Education builds over time. It might feel like the bits of wisdom you acquire don't mean much, but over the years they add up to form a wiser, kinder, more interesting person
.