if you don't climb the mountain, you don't know the height of the sky; I don't know the thickness of the land without facing the deep stream. ("Xunzi") If you don't fly, you will fly into the sky; If you don't sing, you will be a blockbuster. (Sima Qian) Don't worry about people who don't know themselves, but don't know people. (Confucius) Nothing ventured, nothing gained? (Han Shu) If you don't stop, you can't stop. (Han Yu) I don't know the true face of Lushan Mountain, but I am only in this mountain. (Su Shi) is not afraid of floating clouds to cover his eyes, and he is at the highest level. (Wang Anshi) If you don't follow the rules, you can't make a square garden. (Mencius) When will a hundred rivers go east to the sea and return to the west? A lazy youth, a lousy age. (Han Yuefu's "Long Songs") A hundred studies must be determined first. (Zhu Xi)