Here is a proverb my friend provided on keeping a normal heart. She learned it from her political teacher in her middle school.
The followings are Original script, Phonetic script, Transliteration, and Full translation in order.
水 能 载 舟， 亦 能 覆 舟。
Shui neng zai zhou, yi neng fu zhou.
Water can float boat, also can capsize boat.
Water can float the boat, but also can capsize the boat.
This proverb was originally a warning the famous philosopher Xunzi gave to a King. He used the water as metaphor of the people and the boat of King’s authority. It is later used to describe that everything has a positive side and a negative side, so one must handle things carefully.
This proverb shows how the proverb can originally targeting one specific event, but later is re-comprehended and now can have a more general meaning.