The Buddha said, “I have taught dukkha [usually translated as “suffering”] and the end of dukkha.” This teaching is the heart of our practice, yet it is often misunderstood or even confusing to people, primarily because there are at least four different understandings of dukkha in the teachings. We’ll explore the nature of the teaching, emphasizing particularly the interpretation of dukkha as "reactivity" (particularly linked to the teaching of the Two Arrows or Two Darts), which comes in two forms--grasping or greed, and compulsive pushing away or aversion. We'll point to how we might practice with the teaching at this time of crisis--in our formal practice, in our practice in daily life, and in our work, service, and/or activism.