Literature Reference: 秦遣李斯书，书为传国瑞。秦亡汉魏传，传者得神器。卞和名永永，与宝不相坠。劝尔出门行，行难莫行易。易得还易失，难同亦难离。善贾识贪廉，良田无稙穉。磨劒莫磨锥，磨锥成小利。 —— 《杂曲歌辞 出门行》 Qin sent Li Si's writing, which became the treasure of the nation. After Qin's fall, it passed to Han and Wei, becoming a sacred artifact. Bian He's name endures, never losing its value. I urge you to step out, for the hard path is better than the easy one. What is easily gained is easily lost; what is hard to achieve is hard to part with. A wise merchant knows greed from honesty; fertile fields do not yield weeds. Sharpen the sword, not the awl, for the awl brings only petty gains. Source from 'Zaqu Goci: Chu Men Xing'.