“Hope is the single most defining as well as the single most disturbing human emotion.”

“For if there is any single thing that everyone hopes for most dearly, it must be this: that the youngest outlive the oldest.”

“But hope, I can tell you, is an exhausting emotion; perhaps, along with fear, the most exhausting of all. It is like juggling eggs: the hope is the shell, and inside is despair. A single crack and the despair might spill everywhere, stain everything.”

“I'm human. The single most overused excuse on the planet for doing the absolute wrong thing.”

“People often ask, "What is the single most important environmental population problem facing the world today?" A flip answer would be, "The single most important problem is our misguided focus on identifying the single most important problem!”

“The inevitable triumph of illusion over reality that was the single most obvious truth about the history of the human race.”