《老子·道经·第一章》
因此，要常从 无 中去观察领悟 道 的奥妙；要常从 有 中去观察体会 道 的端倪。
故常无，欲以观其妙；常有，欲以观其徼。
Therefore, we must always observe and understand the mystery of the Tao from the void, and we must always observe and experience the beginning of the Tao from existence.