豺狼当道 = jackals and wolves hold sway----the cruel and the wicked are in power
吃得苦中苦,方为人上人
= only by enduring the hardest lot can a person aspire to rise above all others
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差之毫厘,謬以千里 = an error of the breath of a single hair can lead a thousand li astray---a small discrepancy leads to a great error