Fudōshin (Japanese: 不動心) is a state of equanimity or imperturbability (literally and metaphorically, "immovable mind", "immovable heart" or "unmoving heart"). It is a philosophical or mental dimension to Japanese martial arts which contributes to the effectiveness of the advanced practitioner.
Fudō Myōō is found in Shingon Buddhism as a guardian deity, (and patron of martial arts) who is portrayed as carrying a sword in his right hand (to cut through delusions and ignorance) and a rope in his left (to bind "evil forces" and violent or uncontrolled passions and emotions). Despite a fearsome appearance, his attributes of benevolence and servitude to living beings are symbolized by a hairstyle associated with the servant class.
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