Metamorphosis

"We're on a thousand planets and spreading out. We cross fantastic distances and everything's alive, Cochrane. Life everywhere. We estimate there are millions of planets with intelligent life. We haven't begun to map them."

"Our species can only survive if we have obstacles to overcome."

"But I've never been loved. Never. What kind of life is that? Not to be loved, never to have shown love? And he runs away from love."

"Loneliness. This is loneliness. What a bitter thing... oh Zefram, it's so sad! How do you bear it, this loneliness?"