Stern in Chinese / Japanese...

斯特恩 is the name Stern in Chinese (Mandarin).

スターン is the name Stern in Japanese Katakana.

Note: Because this title is entirely Japanese Katakana, it should be written by a Japanese calligrapher.

爱在心里狠在面皮 literally translates as “Love [your] children in [your] heart, [but] be stern [with them] in [your] manner.”

This is a little like saying “Love your child but don't spare the switch.”

烈 is a Chinese word that means ardent; intense; fierce; stern; upright; to give one's life for a noble cause.

In another context, this character can refer to one's exploits or achievements.

In the Buddhist context, this is burning, fierce, virtuous, and/or heroic.

While technically, it had the same meaning in Japanese, it's usually a female given name, Retsu in Japanese these days.

貞烈 is the Japanese Kanji for “Extreme Faithfulness.”

The first Kanji means “firm adherence to one's principles,” chastity (of a woman), chaste, etc.

The second Kanji means ardent, intense, fierce, stern, upright, to give one's life for a noble cause, exploits, achievements, virtuous, and in some contexts, heroic.

Now you get the idea why this refers to someone who is extremely faithful (to a cause, themselves, their religious beliefs, or their philosophy.

When reading an account of some battles in China, I came across the Chinese word, 嚴整. As it turns out, 嚴整 is only used in military circles to describe neat, orderly, and well-disciplined troops. Perhaps this is actually closer to the meaning I was taught while in the U.S. Marines.

The first character literally means stern, serious, strict, or severe (it can also mean airtight or watertight.
The second character means exact, in good order, whole, complete, and orderly.
Together, these two characters multiply each other into a word that expresses the highest military level of discipline.

See Also:  Self-Control | Will-Power