The name Principles of Life in Chinese / Japanese...

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.

捨生取義 is a Chinese proverb that comes from the philosopher Mencius.

It can be translated in a few different ways:
To give up life for righteousness.
To choose honor over life
Better to sacrifice one's life than one's principles.

生活信條 is a Chinese proverb that means “principles of life” or “The personal obligations and rules that you live by.”

For instance, if you were a vegetarian, the act of not eating meat fits into this category.
This could also be translated as a “Way of living.”

At its essence, 理 means science.

理 is a very ambiguous and open term; it speaks to the reason that all things exist, and how things work from the microscopic to the cosmic level.

There are many translations for this word, including inner essence; intrinsic order; reason; logic; truth; science; natural science (esp. physics); principle; the underlying principles of the cosmos; the way of things; ruling principle; fundamental law; intrinsicality; universal basis; or essential element(s).

If you are a scientist, or just searching for “the answer to life, the universe, and everything,” this could be the character for you.

人の道 is the Japanese way to express the “moral way of life,” “correct path,” or “moral principles.”