Out of office, out of danger. 无官一身轻。

Out of debt, out of danger. 无债一身轻。

One's words reflect one's thinking. 言为心声。

One swallow does not make a summer. 一燕不成夏。

One never loses anything by politeness. 讲礼貌不吃亏。

One man's fault is other man's lesson. 前车之鉴。

One hour today is worth two tomorrow. 争分夺秒效率高。

One good turn deserves another. 行善积德。

One false move may lose the game. 一着不慎，满盘皆输。

One eyewitness is better than ten hearsays. 百闻不如一见。