In Lewis' essay The Abolition of Man, he argues that modern education is producing "men without chests" – people whose lives are divided between the purely cerebral and the purely visceral, without any middle ground of sentiment or imagination—and Eustace (in his initial state) is clearly intended to be one of these.
Passages from The Abolition of Man are included in William Bennet's The Book of Virtues which could be said to be a compilation of examples of Lewis's "Tao" system of values or natural law.
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