to emphasize everything is to emphasize nothing en · X
Etymology
Perhaps coined by American liberal arts professor John Scott Clark (see quote 1886) but more likely to be traditional. Used with many variations.
Meanings
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Emphasize excessively and nothing will stand out.
The temptation is constantly to tresspass upon the domain of Elocution, and indicate beforehand all particular emphasis; moreover, to emphasize everything is to emphasize nothing.
1886, John Scott Clark, chapter V, in A Practical Rhetoric for Instruction in English Composition and Revision in College and Intermediate Schools, New York: Henry Holt and Company, page 27: