Jeong Yak-yong (1762. 8. 5. ~ 1836. 4. 7.)

He was a scholar and government official of the late Joseon Dynasty and is known as a representative figure of Silhak, a practical learning movement.

He was born in Majae-ri, Chobu-myeon, Gwangju-bu, Gyeonggi-do in 1762 [16]. His family name was Naju, his courtesy name was Mi-yong (美庸) · Song-bo (頌甫), his pen name was Gui-nong (歸農), and his aliases included Da-san (茶山) · Sam-mi (三眉) · Yeo-yu-dang (與猶堂) · Sa-am (俟菴) · Jaha-doin (紫霞道人) · Tak-ong (籜翁) · Tae-su (苔叟) · Mun-am-il-in (門巖逸人) · Cheol-ma-san-cho (鐵馬山樵).

Everyone is struggling in their own battlefield, so even if you encounter hell from others, be kind to them.
Words that point out faults should be spoken as cautiously as confessing one's own mistakes, only then will they reach the other person.
Just as I gauge others and evaluate their depth, others also look into my bottom and evaluate my depth.
If you use people as a means to weigh things, then I will also become a tool that has lost the hearts of people.
The closer the relationship, the more dearly you should cherish it, and the more familiar you are, the more difficult you should be.
Demanding the same behavior from everyone is the path to losing oneself and losing others, so unanimity is an insult to people.
We have received countless forgivenesses in our lives, knowingly or unknowingly. So be generous to others.
The most mature attitude towards meeting people is not to be disappointed in people beforehand.