Are these words too familiar to you and does it sound trivial? "Great understanding is broad and unhurried; little understanding is cramped and busy."1) In most cases people get more interests on trivial techniques and listen more to interesting chats, but they are not meaningful ultimately. This is why "The subjects on which the Confucius did not talk, were - extraordinary things, feats of strength, disorder, and spiritual beings."2)
What does the way of Haneul mean? It is rightness, which is the essence of morality. What does the way of Tang mean? It is distinctness, which is what the man that want to be right wants to know, the content of morality. What does the way of Saram tell you? It is aggressive promotion, which describes how the man of intention to live in the right way drives himself.
Then what does the principle of Kang say? It is getting the rightness , though it is hard, in concentration of your mind along the good laws, which is the center of etiquette. Then what does the principle of Yu say? It is leading right way out in harmony with changes of others' minds and of world along a careful consideration, which is the root of etiquette.
Therefore, when you get the unity of Samjae and Kang-Yu in this way it means agreement of morality and etiquette that is based on the morality, which is "following your heart's desire not overstepping the boudaries of the right(從心所慾不踰矩)" that confucius talked of. Then, you can get everything with particular intention, which is "doing of not doing(爲無爲)" that Lao-tzu talked of. Looking into its foundation you can find truth over distinction, which is "Vrajna(Prajna, 般若)" of Buddha.(Ch.6) This is Ilgiyae.
1) Chuang Tzu, 제물론, 2. 大知閑閑,小知閒閒.,大言炎炎,小言詹詹.2) 논어, LY0721 子不語怪力亂神.