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. Fudō 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.