Korean Inner Strength in old Korean Hanja...

內力 is the shorter version of inner strength (can also be translated as “internal force”). The first character holds the meaning of “inner” or “internal.” The second character means “power,” “force,” or “strength.”

內力 is a Kung Fu way of talking about an inner power or strength from within. This is a way to express “inner chi.” This is something that you might hear in a real Chinese Kung Fu movie.

While understood in Chinese and Japanese, this can have a secondary meaning of “inner stress” in Japanese.

內在力量 is the slightly-verbose way to say inner strength.

The first two characters mean “intrinsic” or “inner.” The second two characters mean “power,” “force” or “strength” (especially physical strength). 內在力量 is more a short phrase rather than just a word in Chinese and Korean. This can sort of be understood in Japanese but it's not normal/proper Japanese.

自強 is the kind of inner strength that applies to a person who has will-power and can inspire themselves to do great things.

自強 can also be the creed of a person that always pursues self-improvement.

Other translations: self-strengthening, striving for improvement, self-improvement, striving to become stronger, and self-renewal.

堅忍 means persistent, steadfast, fortitude, and/or perseverance.

The first character means strong, solid, firm, unyielding, or resolute.
The second character means to beat, endure, or tolerate.
Together they speak of the strength from within yourself. Some may also translate this as long-suffering in a more Biblical sense.

堅忍 is a common term in Chinese and Korean Hanja but a little less commonly used in modern Japanese Kanji. For that reason, this selection is best if your audience is Chinese or Korean.

Note that when writing this as Kanji, Japanese will tend to write the second Kanji a little differently. If you select our Japanese master calligrapher, please expect the form where the little horizontal stroke crosses the vertical stroke. See differences in the images to the right. Technically, they are both the same character, and will be read the same in either language.