when the sword is sharpened, the plum blossom fragrance comes from bitter cold. Bo Guan and about to take, thick and thin hair. If you don't climb the mountain, you don't know the height of Tian; If you don't face the deep stream, you don't know the thickness of the ground. If you don't prepare, you will stand, and if you don't prepare, you will be abolished. If a worker wants to do something, he must sharpen his tools first. Taking copper as a mirror, you can straighten the Yi crown; Taking the past as a mirror, we can know the rise and fall; Take people as a mirror, you can understand the gains and losses. Haste makes waste, but if you see a small profit, it will be a big deal. Know yourself and know yourself, and you will win every battle. If you don't know enough, you can be reflexive after Ran; Know the difficulties and then be self-reliant. Paper Shang, who came from the end and felt shallow, never knew that he had to do it. Label: the right medicine? Famous words? China's previous article: The meaning of eternal cloud friendship What does it mean? The next article: Write the words of Qingshan and write the poems of Qingshan