《陈书·列传·卷十八》
衹是《干》、《坤》二卦的底蕴还没有剖析，《系辞》体现出的征兆也不曾诠释，使我们一深入到它们的堂奥，便有颇多疑惑。
但《乾》、《坤》之蕴未剖，《系》表之妙莫诠，使一经深致，尚多所惑。
It is just that I have not yet fully analyzed the foundation of the two gua "qian" and "kun". Nor have I ever interpreted the signs that appear in the "Great Commentary", making me have a lot of doubts after I have deeply penetrated their profound meanings.