“a hundred days of sermonizing, one fart” → a metaphor for how something that one has put great effort into can come to nothing after even a slight mistake, much as a hundred days of serious spiritual study can be lost to the winds

pot calling the kettle black; six of one, half a dozen of the other

600-cell; regular hexacosichoron

Kyūjitai form of 正六百胞体: 600-cell; regular hexacosichoron

the famous of the “one hundred poems by one hundred poets” anthologies, compiled by Fujiwara no Teika in c. 1235, used in the basis of certain card games

(Shinto, Japanese mythology) Ugayafukiaezu, the son of Hikohohodemi no Mikoto and Toyotamabime, and the father of Emperor Jimmu

120-cell; regular hecatonicosachoron

Kyūjitai form of 正百二十胞体: 120-cell; regular hecatonicosachoron

(literally) know the other side and yourself, a hundred battles will not be perilous

(Shinto, Japanese mythology) Ugayafukiaezu, the son of Hikohohodemi no Mikoto and Toyotamabime, and the father of Emperor Jimmu