"Where are the people?" resumed the little prince at last. "It's a little lonely in the desert..." "It is… — Antoine de Saint-Exupéry

"Where are the people?" resumed the little prince at last. "It's a little lonely in the desert..."

"It is lonely when you're among people, too," said the snake.

In the original (French)

'Où sont les hommes ?' reprit enfin le petit prince. 'On est un peu seul dans le désert.'

'On est seul aussi chez les hommes', dit le serpent.

Source: Wikiquote · CC BY-SA 4.0