1. "The pendulum of the mind alternates between sense and nonsense,not between right or wrong." - Carl Jung.

2. "your vision will become clear only when you look into your own heart." - C.J.

3. "The healthy man does not torture others; generally, it is the tortured who turn into torturers." - C.J.

4. "Neurosis is always a substitute for legitimate suffering."
- C.J.

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1. Because right and wrong is a matter of contexts; laws, customs, civilizations, religions, sex, ages, race, timing, ...
while sense and nonsense is a matter of healthy mind.

2. Because we are bound to see everything with our individual colored filters(neurosis), and clear vision can be attained only through healthy mind.

3. Because torturing others by the healthy man would torture himself first and the tortured are bound to use their tortured (colored)filters to see the world.

4. Because neurosis starts when feelings of suffering are not
recognized and resolved sensibly and realistically especially when young, and instead stored in mind as a substitute symbolically(source of all different color filters). And it lasts throughout our lives, making enemies, endless wars. So, neurosis defined as conscious mind's response to subconscious emotional conflicts, is the root cause of all human sufferings. You might say that this is the real price for being the top-class animal on earth. Solution?
It's in 1,2,3. And I wrote about it many times in the past years.
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Abraham Maslow's 10 characteristics of mental health;

1. clearer perception of reality.
2. open to experiences.
3. integrity, wholeness of person, unity.
4. spontaneous, expressive, alive.
5. real self, firm identity, autonomy, unique.
6. objective, detachment, transcendance of self.
7. exploration of creativity.
8. ability to fuse concreteness and abstractness, feeling and
reasoning, ie., dichotomies. (ying-yang).
9. democratic(I prefer egalitarian)
10.love of self and others (and nature I'd like to add).
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All above have to work together synergistically, not at the cost of other items. And these are targets, correct visions,
toward which we need to develop; This PROCESS is the contents of happiness, not the state of arrival of goal itself.
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And what is the other side of the above 10 characterristics? It is;
"Mass of people lead lives of quiet desperation, and go to the
graves with their songs still in them" - Henry Thoreau.

"대부분의 사람들은 조용한 절망속에 살다가, 가슴속에 그 절망의 노래를 간직한채, 자신의 무덤까지 간다."