What is the significance of expedients? First of all, let us think about this question from the standpoint of Buddhism in general.

There is a legend that Sakyamuni, when he attained enlightenment under the Bodhi tree at Buddha Gaya, in north-eastern India, was so impressed by its profundity that he remained motionless for hours. Then the Heavenly King Brahman, the lord of our world, came to him and said, “Your state of enlightenment is, indeed, impressive. Nevertheless, no matter how wonderful it may be to you, what good is it to anyone else? How are you going to serve people if you remain silent? Now that you have attained the ultimate truth, Please expound it to the people of the world and deliver them, too, from suffering.” After considering this request, Sakyamuni nodded in agreement, rose from his seat, and set out for Sarnath, where he delivered his first sermon

This legend shows that the profound depth of the Buddha’s enlightenment is almost impossible to express in words. (Otherwise the Buddha would have taught it immediately.) Nevertheless, it must be presented in words and expressed somehow if it is to help people. Words, however, are not always the perfect means of representing facts; they can express only part of them. For instance, we often find it difficult to express our innermost thoughts or complicated physical problems in words. (Physicists generally must resort to mathematical formulae; musicians use music; artists paint, and so on.)