《管子·内业》
模糊得没有人听出它的声音，却又高大地显现在人的心里；昏暗得看不到它的形状，却又滋滋润润地与我们共同生长。
谋乎莫闻其音，卒乎乃在于心；冥冥乎不见其形，淫淫乎与我俱生。
Vaguely no one hears its sound, yet high and vast it manifests itself in people's hearts; dimly no one can see its form, yet it richly moistens and flourishes together with us.