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...
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Gravity is the source of lightness,
Calm, the master of haste.
A lone traveller will journey all day, watching over his belongings;
Yet once safe in his bed he will lose them in sleep.
The captain of a great vessel will not act lightly or hastily.
Acting lightly, he loses sight of the world,
Acting hastily, he loses control of himself.