Why does Ayn Rand identify purpose as one of the three cardinal values? What is the route to realizing this value? Why do many people have trouble settling on a satisfying purpose in their lives? This lecture probes the meaning, value, and requirements of purpose. It explores the material and spiritual dimensions of purpose's value; purpose's relationship to reason and self-esteem; purpose's role in overcoming the "duty" conception of ethics; the relationship between purposefulness on small issues and pursuing a central purpose; and rationalism as an obstacle to embracing a central purpose. The aim is to better understand this pivotal value, which Dr. Smith describes as a passkey to joy.