Second, just as it is the clear mirror that reflects without distortion, or the quiet valley that echoes a sound, so must one who would study Karate-do purge himself of selfish and evil thoughts, for only with a clear mind and conscience can he understand that which he receives. This is another meaning of the element kara in Karate-do. Next, he who would study Karate-do must always strive to be inwardly humble and outwardly gentle. This meaning is also contained in the element kara of Karate-do. It is no exaggeration to say that the original sense of Karate-do is at one with the basis of all martial arts.
Form is emptiness, emptiness is form itself.
The kara of Karate-do has this meaning.