于谦，字廷益，是一个来自浙江钱塘的人。
在宣德元年的时候，他当上了监察御史。
他身材高大挺拔，声音响亮。
每次他在上奏应对时，皇上都会侧耳细听。
然而，于谦非常有学问，他的内心并不贪婪，而且遇到事情总是勇往直前，很少犹豫不决。
这使得一些人对他感到嫉妒和恨意。
在他当了九年的官之后，才升职为左侍郎。
以前，河南的官员们在去京城见皇帝或者办事的时候，通常会带些绢帕、蘑菇等地方特产作为礼物。
但是，当于谦在河南当巡抚的时候，每次回京城议事，他都不会带任何贵重的东西。
他还写了一首诗说：“因为官员强行派征、搜括，所以这些手帕、蘑菇、线香这些地方特产无法供人民享用，反而使人民因此遭殃。我回京时，什么也没带，只有满袖的清风去朝见天子，这样就不会让老百姓来批评我。”
这就是他如何约束自己的行为。
“两袖清风”这个成语就是从这里来的。
它用来形容一个官员非常廉洁，没有贪污的行为。
也可以用来形容一个人潇洒飘逸，超脱凡俗的样子。
Yu Qian, also known as Tingyi, was a man from Qiantang in Zhejiang.
In the first year of Xuan De, he became a censorial supervisor.
He was tall and straight, with a loud voice.
Whenever he presented his opinions to the emperor, the emperor would listen attentively.
However, Yu Qian was very knowledgeable, not greedy at heart, and always brave when facing things, rarely hesitating.
This made some people jealous and hateful towards him.
After serving as an official for nine years, he was promoted to Left Vice Minister.
Previously, officials from Henan usually brought gifts such as silk handkerchiefs and mushrooms when they went to the capital to see the emperor or handle affairs.
But when Yu Qian served as governor of Henan, every time he returned to the capital to discuss matters, he would bring nothing valuable.
He even wrote a poem saying, "Because officials force levies and search, these local specialties such as handkerchiefs, mushrooms, and incense cannot be enjoyed by the people, but instead bring disaster to them. When I return to the capital, I bring nothing but clear winds in both sleeves to see the Son of Heaven, so that the common people will not criticize me."
This is how he restrained himself.
The idiom 'Two Empty Sleeves' comes from here.
It is used to describe an official who is extremely honest and incorruptible.
It can also be used to describe someone who is carefree and unconventional.
