] The reader may be disposed to wonder how I could prevail on myself to give so free a representation of my own species, among a race of mortals who are already too apt to conceive the vilest opinion of humankind, from that entire congruity between me and their Yahoos.
There are no more uses of "congruity" in the book.
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He thinks that he likes their talk and way of life because of some congruity between their spiritual state and his, when in fact they are so far beyond him that if he were not in love he would be merely puzzled and repelled by much which he now accepts.
C.S. Lewis -- The Screwtape Letters
It was a spot which returned upon the memory of those who loved it with an aspect of peculiar and kindly congruity.