“What kind of intelligent beings would evolve on a planet that is all mountains?”
“Stupid ones!” Casker said.
Untouched by Human Hands (p. 75)
Short fiction, Untouched by Human Hands (1954)
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Robert Sheckley 114
American writer 1928–2005Related quotes
Source: Animals Matter: A Biologist Explains Why We Should Treat Animals with Compassion and Respect

The Age of Spiritual Machines: When Computers Exceed Human Intelligence (1999)

Philosophiae Naturalis Principia Mathematica (1687), Scholium Generale (1713; 1726)
Source: The Principia: Mathematical Principles of Natural Philosophy
Context: This most beautiful System of the Sun, Planets and Comets, could only proceed from the counsel and dominion of an intelligent and powerful being. And if the fixed Stars are the centers of other like systems, these being form'd by the like wise counsel, must be all subject to the dominion of One; especially, since the light of the fixed Stars is of the same nature with the light of the Sun, and from every system light passes into all the other systems. And lest the systems of the fixed Stars should, by their gravity, fall on each other mutually, he hath placed those Systems at immense distances one from another.
“There are only two races on this planet — the intelligent and the stupid.”
As quoted in Daily Telegraph (15 August 1991)