Career
Born into the privileged Kajiwara family, he began his service by becoming a page at Jufuku-ji at the age of 13. He became a priest at the age of 18, in Hitachi Province, moving to Kanto for his studies. He founded Choraku-ji temple in Ueno as well as various other temples, and retired at the age of 80.
His most important teacher was Enni, who practiced zazen as well as the engaged study of various traditions.
The only ideology Mujū disapproved of was intolerance, and he "was himself aware of, and intrigued by, the paradox of the position".