All of us get discouraged at times, but we shouldn't be tempted to think that we need a fraudulent Jewish ghost or a mindless Christian ethical system. We are fighting for the people and the things that we love in life, and that is more than enough reason to fight. All the evidence our heart needs come from the pleasure we feel in that which we love, and the pain that we feel in losing it. And all the evidence our mind needs starts with the fundamental Epicurean observation we make with our own eyes: that nothing comes from nothing, and nothing goes to nothing.