Strength Lies Within in Chinese / Japanese...

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.

内面の強さは外見の良さに勝る is a Japanese proverb that literally translates as “inner/internal strength/power [versus] outward-appearance [the] merit/virtue/good quality [does] excel/surpass/exceed/outweigh.”

More naturally in English, this would be “Inner Strength Outweighs Outward Appearance.”

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

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.

表壯不如里壯 literally translates as: [Better to be] strong inside than [to be] strong outside.

The ancient original meaning was:
[An] able [husband] outside [working to support a family is] not as good as [an] able [wife] inside [working and saving to take care of the family].

The current meaning is:
Inner strength is more important than outward appearance.

自強不息 is a proverb or idiom that suggests that the pursuit of self-improvement is eternal. It can also be a suggestion to strive unremittingly in life.

The first two characters mean inner strength with the idea of self-improvement. The last two characters mean “never rest” or “striving without giving up.”

Some will translate these four characters as “Exert and strive hard without any let-up.”

內健 is an old Chinese word meaning inner strength or inner health.

It's the idea of health and well-being starting or residing inside yourself. Also defined as fortitude within the context of good health.