《论衡·卷二十四·卜筮篇》
假如让卜筮的人平白无故地钻薄龟甲而卜问，毫无目的地摆弄蓍草来算卦，对天地进行戏弄，也会得到兆数，难道天地在胡乱答复吗？
试使卜筮之人，空钻龟而卜，虚揲蓍而筮，戏弄天地，亦得兆数，天地妄应乎？
If you let the diviner drill through the thin turtle shell for no reason, and then ask a question, or play with the yarrow stalks for no reason, and tell fortunes, and play tricks on heaven and earth, you will also get a sign. Is heaven and earth answering randomly?