Metanoia means the action of changing your mind or thinking, that is, stop following or believing in a certain thing to experience a new way of looking at life, for example.
From a theological point of view, methanoia represents the process of repentance and conversion of the individual to a certain doctrine. It consists of the reinterpretation that the person has of his life, whether morally, intellectually or spiritually.
For religion, methanoia is a constant and growing process that begins from the moment the individual recognizes and accepts his faith in the doctrine that was preached to him.
For psychology, methanoia is the change in the individual's mental model, representing a process of reform of the person's psyche. Learning is responsible for this change, both rationally, intellectually, emotionally and spiritually. Thus, it can be said that methanoia is a profound transformation of the individual, when he alters his consciousness of the world, either expanding it or limiting it.
Etymologically, the word methanoia originated from the Greek methanoein, formed from the union of goal, which means "after"; and νοῦς, which means "thought" or "intellect". Thus, the literal interpretation of this term would be akin to "changing one's thinking".