How to study the kata
In the past, it was expected that about three years were required to learn a single kata, and it was usual that even an expert of considerable skill would only know three or at the most five kata. Thus, in short, it was felt that a superficial understanding of many kata was of little use. The aim of training reflected the precept expressed by the words, "Although the doorway is small, go deeply inward." I, too, studied for ten years to really learn the three Tekki forms. However, since each form has its particular good points and because there is also benefit to be gained from knowing a wide selection of forms, one might well reconsider the practice of becoming deeply engrossed in very few forms. Whereas people in earlier times made deep studies of a narrow field, people today study widely and not deeply. It is not a good idea to follow one way or the other; it is better to take the middle way. For this reason, I have employed the method of advancing students as soon as they have a good grasp of a form to the next one, up through the fifth Heian form or the third Tekki form, and of then returning to the first for renewed practice. Once a form has been learned, it must be practiced repeatedly until it can be applied in an emergency, for knowledge of just the sequence of a form in karate is useless.
pp38-39 (1973 edition)
The phrase that grabbed me -
QUOTE
knowledge of just the sequence of a form in karate is useless
Mick