A text becomes complete when it no longer needs the reader to guess.
A text fails in a simple way. One word is unclear, one boundary is unstated, one step is skipped, and you cannot decode the sentence with full confidence. You can still move on, but you are now running an internal guess. The text did not give you a single forced meaning. It left a gap, and the gap becomes part of the content, because whatever crosses the gap changes what the sentence really says.
A complete explication is a text that removes these gaps, not by being long, but by making every load bearing point forced. When a term matters, the text binds it. When a claim applies only under conditions, the text states the conditions. When a claim excludes cases, the text states what is excluded. When a sentence depends on an unseen step, the step is written or explicitly declared as a primitive for this text. The goal is not to decorate. The goal is that nothing essential is left for the reader to reconstruct.
Depth means repeating this until it stops changing the text in essential ways. You do not stop because you are satisfied. You stop when pressing the text with why and how can no longer force a new missing piece. Before that point, a good question exposes another gap that changes the meaning, so the text must grow. After that point, questions do not force new pieces. They only point to places inside what is already explicit.
This is the sense in which the object is finite. Finite does not mean short. It means closed. The process of closing gaps terminates. There is a last layer, after which "go deeper" cannot mean "write a missing condition," because no missing condition remains. Past that layer, you can still rewrite for elegance, but you cannot change what is necessary for the text to stand.
That is why the title is literal. When questions stop generating new information, it means the text has reached closure. The questions have changed from extraction to navigation. They no longer uncover missing meaning. They only locate what is already there.
A complete text is the point where questioning stops building and starts pointing.