Answer:
theme
Step-by-step explanation:
A theme is the main idea or the underlying meaning of a literary work. It is characterizad by being universal, in other words, these ideas don't aplly only to specific characters or events in the literary work. They refer to broader truths about human life and experience. In this way, the audience can learn from it and apply it to their lifes.
In this case "Time heals all wounds" is the main idea of a text, this is present in the whole story and might give teachings.
On the other hand, the plot is used to develop a series of events within a text. It is the storyline of a text. You can follow the events in an explicit way.