Robert A. Heinlein Quote

He posed me a question which I must answer correctly—else he will not co-operate.
Huh? What was the question?
I'll ask you. Martha, what is the meaning of life?
What! Why, what a stupid question!
He did not ask it stupidly.
It's a psychopathic question, unlimited, unanswerable, and, in all probability, sense free.

Chapter 2, Rich Man, Poor Man, Beggar Man, Thief— (p. 35; see also pages 31, 33) - Beyond This Horizon (1948; originally serialized in 1942)