Hekiganroku - Case 78: The Boddhisattvas Take a Bath

In the old days there were sixteen bodhisattvas. When the monks took a bath,
they too entered the bath according to their custom. At once they realized
the cause of water. Now, my Zen friends, how do you understand this? [1]
The bodhisattvas said, "Wonderful feeling! Perfectly clear! We have attained
the dwelling place of the children of Buddha." You can attain it -- only by
breaking through seven times and digging through eight times.

[1]: It is Setcho who speaks here.