What's the big deal about not bragging?

Hide from the armor. Dunga's special door is the crystallization of the wisdom of a teacher who doesn't brag, leading him into the mysterious hall easily. Dunjia Qimen is an ancient book in China and is often regarded as a book of divination. Daoism was originally a metaphysics of who has the upper hand, who has the initiative and who has the advantage in military struggle. Qimen is a kind of magic number, which prevailed in the Southern and Northern Dynasties. Qimen was used in the military at the beginning of its establishment, mainly for marching and fighting.