Psychological health depends on at least one good friendship which is itself based on shared reality.
This shared “reality” is the reality of how the two (or more) good friends actually function. How their speaking, listening, thinking, and feeling actually function and interact in real-time.
They have to know this about each other and even more importantly, they have to want to know this.
If you have or have had that, you will be or become psychologically healthy. If you have never had that, you will not be psychologically healthy.
This “shared reality” is not static and can never be static. It is always changing, adapting. It must be dealt with honestly.
“Aristotle describes three general types of friendship, that of utility, that of pleasure, and that of good or virtue.” (Aristotle on Friendship)
The perfect form of friendship is that between the good, and those who resemble each other in virtue. For these friends wish each alike the other’s good in respect of their goodness, and they are good in themselves; but it is those who wish the good of their friends for their friends’ sake who are friends in the fullest sense, since they love each other for themselves and not accidentally. (same link as above)
If during your formative years, your parents, teachers, and friends did not wish for your goodness for your sake and you have not since formed a good or virtuous friendship, you will not be psychologically healthy. This does not mean you are doomed, it just means you are not psychologically healthy.
To achieve good health, you have to have a “good or virtuous” friend and you have to be that back to them. There is no other way.
If you have an Aristotelian friend of pleasure, you can upgrade this relationship to a good or virtuous one by doing FIML practice. FIML is essential in today’s world because semiotic interactions are so complex, far more complex than in Aristotle’s day.
Good or virtuous friends need FIML to maintain their shared reality.
On rereading, the above sounds harsh to me. But when I consider the world as it is, it also sounds true, realistic. Earth can be a very bad place but it can also be very good.