The effects of psychotherapy can also be explained with Network Theory: in the course of effective psychotherapy, the strength of interaction between depressive symptoms decreases, e.g. psychomotor retardation is less likely to be associated with suicidal ideation. Or in less technical language: when you are treated with effective psychotherapy, feelings of inertia are less likely to lead to feeling that life is not worth living. Or even more simply: as a result of treatment with effective psychotherapy, life does not spin out of control as readily when you are not feeling well.
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Schumacher, L., Klein, J. P., Elsaesser, M., …, & Kriston, L. (2023). Implications of the Network Theory for the Treatment of Mental Disorders: A Secondary Analysis of a Randomized Clinical Trial. JAMA psychiatry, e232823. Advance online publication. https://doi.org/10.1001/jamapsychiatry.2023.2823