“Happiness and the absurd are two sons of the same earth. They are inseparable.”

Prose V, line 1; translation by W.V. Cooper
The Consolation of Philosophy · De Consolatione Philosophiae, Book IV

The Myth of Sisyphus (1942), The Myth of Sisyphus
Context: One does not discover the absurd without being tempted to write a manual of happiness. "What! — by such narrow ways —?" There is but one world, however. Happiness and the absurd are two sons of the same earth. They are inseparable. It would be a mistake to say that happiness necessarily springs from the absurd discovery. It happens as well that the feeling of the absurd springs from happiness.

0 min 45 sec
Cosmos: A Personal Voyage (1990 Update), One Voice in the Cosmic Fugue [Episode 2]
Context: All my life, I've wondered about life beyond the earth. On those countless other planets that we think circle other suns, is there also life? Might the beings of other worlds resemble us, or would they be astonishingly different? What would they be made of? In the vast Milky Way galaxy, how common is what we call life? The nature of life on earth and the quest for life elsewhere are the two sides of the same question: the search for who we are.

Source: Everybody’s Autobiography (1937), Ch. 2

The Mahabharata/Book 1: Adi Parva/Section CXXIV

On flying over the Rocky Mountains, as quoted in Lindbergh (1978) by Leonard Mosley

Tomlinson, l. 58-61.
Other works