《旧唐书·列传·卷四十二》
魏元忠嫉妒武三思专权用事，心中常生愤慨之情，叹息不已，总想除掉武三思。
元忠又嫉武三思专权用事，心常愤叹，思欲诛之。
Wei Yuanzhong was jealous of Wu Sansi's monopoly of power and was often resentful and sighed deeply. He always wanted to remove Wu Sansi.