Nan-in, a Japanese master during the Meiji era (1868-1912), received a university professor who came to inquire about Zen.
Nan-in served tea. He poured his visitor's cup full, and then kept on pouring.
The professor watched the overflow...
The Way has no true shape,
And therefore none can control it.
If a ruler could control the Way
All things would follow
In harmony with his desire,
And sweet rain would fall,
Effortlessly slaking every thirst.