Fudōshin
Fudōshin is a state of equanimity or imperturbability. It is a philosophical or mental dimension to Japanese martial arts which contributes to the effectiveness of the advanced practitioner.
Fudo myōō is found in Shingon Buddhism as a guardian deity, who is portrayed as carrying a sword in his right hand and a rope in his left. Despite a fearsome appearance, his attributes of benevolence and servitude to living beings are symbolized by a hairstyle associated with the servant class.
