Karate Philosophy In Karate-Do Kyohan, Funakoshi quoted from the Heart Sutra, which is prominent in Shingon Buddhism: "Form is emptiness, emptiness is form itself" (shiki zokuze k? k? zokuze shiki). He interpreted the "kara" of Karate-d? to mean "to purge oneself of selfish and evil thoughts ... for only with a clear mind and conscience can the practitioner understand the knowledge which he receives." Funakoshi believed that one should be "inwardly humble and outwardly gentle." Only by behaving humbly can one be open to Karate's many lessons. This is done by listening and being receptive to criticism. He considered courtesy of prime importance. He said that "Karate is properly applied only in those rare situations in which one really must either down another or be downed by him." Funakoshi did not consider it unusual for a devotee to use Karate in a real physical confrontation no more than perhaps once in a lifetime. He stated that Karate practitioners must "never be easily drawn into a fight." It is understood that one blow from a real expert could mean death. It is clear that those who misuse what they have learned bring dishonor upon themselves. He promoted the character trait of personal conviction. In "time of grave public crisis, one must have the courage ... to face a million and one opponents." He taught that indecisiveness is a weakness.