Guts in Chinese / Japanese...

勇氣 is one of several ways to express bravery and courage in Chinese, Japanese, and Korean.

This version is the most spiritual. This is the essence of bravery from deep within your being. This is the mental state of being brave versus actual brave behavior. You'd more likely use this to say, “He is very courageous,” rather than “He fought courageously in the battle.”

The first character also means bravery or courage when it's seen alone. With the second character added, an element of energy or spirit is added. The second character is the same “chi” or “qi” energy that Kung Fu masters focus on when they strike. For this reason, you could say this means “spirit of courage” or “brave spirit.”

This is certainly a stronger word than just the first character alone.

Beyond bravery or courage, dictionaries also translate this word as valor/valour, nerve, audacity, daring, pluck, plucky, gallantry, guts, gutsy, and boldness.

This is also one of the 8 key concepts of tang soo do.

While the version shown to the left is commonly used in Chinese and Korean Hanja (and ancient Japanese Kanji), please note that the second character is written with slightly fewer strokes in modern Japanese. If you want the modern Japanese version, please click on the character to the right. Both styles would be understood by native Chinese, Japanese, and many (but not all) Korean people. You should make your selection based on the intended audience for your calligraphy artwork. Or pick the single-character form of bravery/courage which is universal.

根性論 is a Japanese title that refers to the belief that where there's a will, there's a way.

Another way to translate this is “The Guts Theory” or “The Doctrine of Will-Power.” Maybe breaking down the meaning of the characters will help clarify this:
根性 = will-power; guts; temper; nature; spirit; nature and character; the nature of the powers of any sense.
論 = theory; doctrine; treatises on dogma, philosophy, discipline, etc.

迫力 is a Chinese word that is a form of personal strength.

It is a word that describes a person who is willing to take a risk. In English, we might say, “Someone with guts.”

An example might be a person that is not rich but invests a lot of money into something (knowing they could double their money or lose it all). Win or lose, this is a person that knows or pushes their potential.

Tearing this word apart, the first character means “to compel,” urgent, urge, force, imminent, or “spur on.” The second means power, strong, bear, or exert.

Note: 迫力 is also a word in Japanese Kanji and Korean Hanja but with a meaning more like force, intensity, appeal, strength, impact, force, or simply power.

While difficult to translate “No guts no glory,” into Mandarin Chinese, 無勇不榮 is kind of close.

The first two characters mean “without bravery,” or “without courage.” In this case, bravery/courage is a stand-in for “guts.”

The last two characters mean “no glory.”

The idea that guts (internal organs) are somehow equal to courage, does not crossover to Chinese. However, translating the phrase back from Chinese to English, you get, “No Courage, No Glory,” which is pretty close to the intended idea.

腹が据わる is a Japanese proverb that means to have guts or to be unwavering in one's resolution.

Note: Because this selection contains some special Japanese Hiragana characters, it should be written by a Japanese calligrapher.

鉄心石腸 is a Japanese proverb that suggests you should have the inner-strength and will as hard and steadfast as iron.

It's the Japanese way of saying, “stay strong.” This is an especially uplifting thing to say to a person in distress or recovering from a disaster. It's kind of the survivor's creed.

If you literally translate this, it means “iron will, stone guts” or “iron heart, rock-hard bowels.”