One must have concrete evidence to prove an accusation, especially in cases of wrongdoing like adultery or theft. It emphasizes the necessity of irrefutable proof.
他平时做事非常严谨，总是强调“捉奸见双，抓贼见赃”，从不轻易下结论。
He is very meticulous in his work, always emphasizing the principle that one must have concrete evidence for accusations, never jumping to conclusions easily.
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