Zen is practice and realization of the Buddha heart. Its tradition came from India associated with extreme detachment, fearlessness and meditation. Its practice is inquiry into the nature of self. Its realization is the transcendental aloneness of the Buddha's 'In heaven and earth I alone am the World-honoured one.' In expression it has shown freedom from fear of death, a certain carelessness as to what may happen, and inspiration in all the concerns of life, great and small.