In the Melancholic-Phlegmatic, melancholic measure rules and phlegmatic stability serves it, giving continuity to the judgment once formed. The result is a firmness of criterion. The image is snow, a crystallization that settles and gently stabilizes over things.
What they keep, in the first place, is not the outward configuration, but the judgment they formed about it. If the judgment truly changes, outward change can be accepted with relative calm; if the conclusion stands, they can adapt on the outside and keep resisting on the inside, and those who live with them sometimes only find this out much later. The appearance of immobility, however, is not enough to recognize them, because it can come from conflict, fear, illness, or institutional position.
The good proper to this form is not abandoning a correct judgment merely because of pressure, convenience, or a change of setting, and being able to stand alone with a true reason. The temptation proper to it is rigidity of criterion, when changing a conclusion comes to threaten the identity of the one who "saw correctly" and the person hides contrary reasons or treats correction as an offense. Revising too early to please others would also be a mistake; firmness and correctability depend on the object of the judgment.
The mature form of the Melancholic-Phlegmatic is a correctable firmness: holding to what they have sufficient reasons for and changing when reality defeats those reasons. They remain delicate, quiet, and faithful to the essential, and they learn that firmness is not infallibility, and that admitting their own mistake does not diminish them, but returns them to the truth they always wanted to serve.