a poor craftsman blames his tools

a poor craftsman blames his tools

If someone performs a job or task poorly or unsuccessfully, they will usually lay the blame on the quality of their equipment, or other such external factors, rather than take responsibility for their own failure. After John spent all day assembling his new desk only to discover it was lopsided, he immediately declared that the package must have contained the wrong pieces. His wife replied, "only poor craftsmen blame their tools, dear."
See also: blame, poor, tool