“Even godlike aliens have to act rationally—don’t they?”

Source: Tuesdays with Morrie

Attributed to Maslow by Toni Galardi in The LifeQuake Phenomenon: How to Thrive (Not Just Survive) in Times of Personal and Global Upheaval (2009). Also to be found in other self-help books and on many quotes sites, but always without citation.
Quotes attributed to Abraham Maslow

19 December 1749
Letters to His Son on the Art of Becoming a Man of the World and a Gentleman (1774)
Context: We must not suppose that, because a man is a rational animal, he will, therefore, always act rationally; or, because he has such or such a predominant passion, that he will act invariably and consequentially in pursuit of it. No, we are complicated machines; and though we have one main spring that gives motion to the whole, we have an infinity of little wheels, which, in their turns, retard, precipitate, and sometime stop that motion.

The Paris Review interview
Context: Why do human beings need to confess? Maybe if you don’t have that secret confession, you don’t have a poem — don’t even have a story. Don’t have a writer. If most poetry doesn’t seem to be in any sense confessional, it’s because the strategy of concealment, of obliquity, can be so compulsive that it’s almost entirely successful.

The Moon Is a Harsh Mistress (1966)
Context: A rational anarchist believes that concepts, such as "state" and "society" and "government" have no existence save as physically exemplified in the acts of self-responsible individuals. He believes that it is impossible to shift blame, share blame, distribute blame... as blame, guilt, responsibility are matters taking place inside human beings singly and nowhere else. But being rational, he knows that not all individuals hold his evaluations, so he tries to live perfectly in an imperfect world... aware that his efforts will be less than perfect yet undismayed by self-knowledge of self-failure.

VII, 11
Meditations (c. 121–180 AD), Book VII

Source: The Last Colony (2007), Chapter 7 (p. 136)