The necessity for Intelligence

From "The Time Machine" - H.G. Wells, 1895:

"It is a law of nature we overlook, that intellectual versatility is the compensation for change, danger, and trouble. An animal perfectly in harmony with its environment is a perfect mechanism. Nature never appeals to intelligence until habit and instinct are useless. There is no intelligence where there is no change and no need of change. Only those animals partake of intelligence that have to meet a huge variety of needs and dangers."

In case you don't know the story, a synopsis is here. As far as I'm concerned though, well worth reading in full.