入木三分 is a four-character Chinese proverb that translates in English to a strong form of “profound” or “written with a forceful hand.”

But there is much more to the story...

The deep meaning behind this proverb comes from a man named Wan Xizhi, who lived in the third century.

He was a great writer and calligrapher whose writing style influenced generations of other writers and calligraphers.

He once wrote words on a piece of wood to be taken to an engraver.
When the engraver began to carve the characters into the wood, he found that Wang Xizhi's writing had penetrated the wood about 3/8 of an inch.

Thus people believed that his words were so powerful and profound that they caused the ink from his brush to penetrate the wood deeply.

The proverb literally means “penetrated wood three fen” (A fen is an ancient Chinese measurement of a little over 1/8 of an inch or almost 4mm).

強 is a character that means strong, strength, force, powerful, better, stubborn, and stiff (yes, all of this in one character).

This “strong” has less to do with physical strength and more to do with having a winning attitude, or just having the ability to win at something.

Note that most of the time, this character is pronounced “qiang” but when used with the meaning of stubborn, unyielding, or stiff, it is pronounced “jiang” in Chinese.

Also, sometimes “qiang” is used in modern Chinese to describe people that do crazy things (For example: Bicycling from Beijing to Tibet alone). I sometimes can be found outside my Beijing apartment wearing nothing but shorts and a tee-shirt while eating ice cream during a snow storm, just to hear my neighbors call me “qiang.” Maybe they mean “strong” but perhaps they are using the new meaning of “crazy strong.”

強 can also be a Chinese surname that romanizes as Jiang in the mainland or Chiang if from Taiwan.

強 is a valid Korean Hanja character with the same meaning but is mostly used in compound Korean words.

強 is used in Japanese (though normally in compound words). In Japanese, it has the same meaning but in some contexts can mean “a little more than...” or “a little over [some amount].” Most Japanese would read this as tough, strength, stiff, hard, inflexible, obstinate, or stubborn.

The variant 彊 is sometimes seen in older literature.

一言九鼎 is an ancient Chinese proverb used in modern times to talk of profound or powerful words.

The literal meaning is “one word [worth] nine [sacred] tripods.” The tripod is a highly-prized three-legged (sometimes four-legged) metal pot or kettle of ancient China. They are often made of bronze, and the Emperor would have large ones gilded in gold. See the image to the right for an example.

Long ago in what is now China, there were many kingdoms throughout the land. This time period is known as “The Warring States Period” by historians because these kingdoms often did not get along with each other.

Sometime around 279 B.C. the Kingdom of Chu was a large but not particularly powerful kingdom. Part of the reason it lacked power was the fact that the King was surrounded by “yes men” who told him only what he wanted to hear. Many of the King's court officials were corrupt and incompetent which did not help the situation.

The King was not blameless himself, as he started spending much of his time being entertained by his many concubines.

One of the King's ministers, Zhuang Xin, saw problems on the horizon for the Kingdom, and warned the King, “Your Majesty, you are surrounded by people who tell you what you want to hear. They tell you things to make you happy and cause you to ignore important state affairs. If this is allowed to continue, the Kingdom of Chu will surely perish, and fall into ruins.”

This enraged the King who scolded Zhuang Xin for insulting the country and accused him of trying to create resentment among the people. Zhuang Xin explained, “I dare not curse the Kingdom of Chu but I feel that we face great danger in the future because of the current situation.” The King was simply not impressed with Zhuang Xin's words.
Seeing the King's displeasure with him and the King's fondness for his court of corrupt officials, Zhuang Xin asked permission from the King that he may take leave of the Kingdom of Chu, and travel to the State of Zhao to live. The King agreed, and Zhuang Xin left the Kingdom of Chu, perhaps forever.

Five months later, troops from the neighboring Kingdom of Qin invaded Chu, taking a huge tract of land. The King of Chu went into exile, and it appeared that soon, the Kingdom of Chu would no longer exist.

The King of Chu remembered the words of Zhuang Xin and sent some of his men to find him. Immediately, Zhuang Xin returned to meet the King. The first question asked by the King was “What can I do now?”

Zhuang Xin told the King this story:

A shepherd woke one morning to find a sheep missing. Looking at the pen saw a hole in the fence where a wolf had come through to steal one of his sheep. His friends told him that he had best fix the hole at once. But the Shepherd thought since the sheep is already gone, there is no use fixing the hole.
The next morning, another sheep was missing. And the Shepherd realized that he must mend the fence at once. Zhuang Xin then went on to make suggestions about what could be done to reclaim the land lost to the Kingdom of Qin, and reclaim the former glory and integrity of the Kingdom of Chu.

The Chinese idiom shown above came from this reply from Zhuang Xin to the King of Chu almost 2,300 years ago.
It translates roughly into English as...
“Even if you have lost some sheep, it's never too late to mend the fence.”

This proverb, 亡羊补牢犹未为晚, is often used in modern China when suggesting in a hopeful way that someone change their ways, or fix something in their life. It might be used to suggest fixing a marriage, quitting smoking, or getting back on track after taking an unfortunate path in life among other things one might fix in their life.

I suppose in the same way that we might say, “Today is the first day of the rest of your life” in our western cultures to suggest that you can always start anew.

Note: This does have Korean pronunciation but is not a well-known proverb in Korean (only Koreans familiar with ancient Chinese history would know it). Best if your audience is Chinese.