Expansion of idea on A bad workman blames his work
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so they blames their own work and try to spoil their image
Answer:
A bad workman blames his tools
If someone performs a job or task poorly or unsuccessfully, they will usually lay the blame on anything except himself. He will blame the quality of his equipment, or other external factors, rather than take the responsibility for his own failure.
Students should not behave like a bad workman. When they get low gradings, it is pointless to blame their teachers and text books or pens or notebooks. In fact, a low grade should inspire them to study harder.
A good workman would take full responsibility for any fault and not try to blame his equipment. He is wise enough to to learn from his mistakes and improve the quality of his work. Therefore, someone blaming poor work on his or her tools must not be very skilled.
In other words, a person who is unskilled cannot do skilled work even with the best tools.