We are often told that happiness, or at least its pursuit, is the most important goal in life. But many of us struggle to figure out just how to achieve this elusive joy. In his 2010 novel “I Shall Wear Midnight,” from his 41-book “Discworld” fantasy series, author and literary icon Sir Terry Pratchett offers us a hint: If we spend life’s precious days intentionally unearthing our own greatest talents, passions, and abilities, happiness will follow where they lead.