[E]dged tools are dangerous things to handle, and not infrequently do much hurt. – Agnes Reppllier, “Wit and Humor,” 1892 [A bit of context here: “Wit is the salt

Good workmen never quarrel with their tools. – Lord Byron, Don Juan

Are the tools without, which the carpenter puts forth his hands to, or are they and all the carpentry within himself; and would he not smile at the notion that chest or house is more than he? – C.A. Bartol, The Rising Faith, Chapter XI: Personality, 1873

Men have become the tools of their tools. – Henry David Thoreau, Walden