For small creatures such as we the vastness is bearable only... - Carl Sagan

"Somewhere, something incredible is waiting to be known."

"You can get into a habit of thought in which you enjoy making fun of all those other people who don't see things as clearly as you do. We have to guard carefully against it."

"Who is more humble? The scientist who looks at the universe with an open mind and accepts whatever the universe has to teach us, or somebody who says everything in this book must be considered the literal truth and never mind the fallibility of all the human beings involved?"

"If it can be destroyed by the truth, it deserves to be destroyed by the truth."

"La prueba de ausencia no es prueba de ausencia"