alone

"Autobiography begins with a sense of being alone. It is an orphan form."

"None of us will ever accomplish anything excellent or commanding except when he listens to this whisper which is heard by him alone."

"If it's true that our species is alone in the universe, then I'd have to say the universe aimed rather low and settled for very little."

"I knew I was alone in a way that no earthling has ever been before."

"He alone is free who lives with free consent under the entire guidance of reason."

"God created man and, finding him not sufficiently alone, gave him a companion to make him feel his solitude more keenly."