Do you want to see the power of extinguishing [attachments]?
Dogen drew a single horizontal line [the character for ‘one’] with his whisk and said: Although this is so, ultimately, six times six is thirty-six.*

* ‘Six times six is thirty-six’ is simple, like ‘one plus one equals two.’ So this could be understood as saying that spiritual powers are simple, everyday matters. But ‘six times six is thirty-six’ also implies many powers beyond just six, indicating that there are not just thirty-six but innumerable spiritual powers. (Leighton & Okumura).