“We’re human, and mere survival isn’t enough,” he continued after a moment. “We have executive function and theory of mind and language. We make plans. It’s what makes our species so spectacularly successful. But we need to have some hope for the future, we need to be able to think we see light at the end of the tunnel, or we despair and we give up and then we die. If you like, our biggest adversary is our own fear.
