In Chesterton's essay "The Revival of Philosophy – Why?", he wrote:
[...] not merely by the sound of a syllable or the look of four letters beginning with a “R”.
I wonder what these four letters beginning with an "R" are.
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R stands for King. That copy of the essay has a typo in it. Here is an essay without the typo: https://www3.nd.edu/~afreddos/courses/43811/Why%20Philosophy.htm
But, anyhow, he will have the habit of testing the thing by the thought; by the idea which he likes or dislikes; and not merely by the sound of a syllable or the look of four letters beginning with a "k".