Does 1 Corinthians 13:8–10 teach that tongues, prophecy, and supernatural knowledge would cease when Christ returns — or when the New Testament canon was complete? The answer hinges on a single Greek word: τὸ τέλειον — "that which is perfect." Its gender alone tells us more than most commentators let on. In this article we work through the grammar, the context, and the competing views to show why the canonical completion position is the only reading that holds up under honest exegesis.