pride goes before a fall 骄者必败；骄兵必败；骄傲必败

【例句】
Don't be proud, because pride goes before a fall.
千万不要骄傲，因为骄兵必败。

Everyone, young or old, must keep in mind that pride goes before a fall.
每个人，不管是年轻人还是老年人都应铭记“骄者必败”。