一天，当老子正从东边经过河南的函谷关时，一缕紫色的薄雾突然出现在空中。
One day, when Laozi was traveling through the Hangu Pass in Henan from the east, a purple mist suddenly appeared in the air.
旧函谷关、新函谷关和潼关，是崤函古道上先后兴替的三座雄关。
The Old and New Hangu Passes and Tongguan Pass used to be the three impregnable passes along the ancient Xiaohan Road.
老子在西出函谷关时，被边防人员拦住，写下了《道德经》后才被放行。
Laozi was stopped by frontier guards when leaving Hangu Pass for the west, let go after writing down Tao te Ching.
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