Tarski's undefinability theorem

Tarski's undefinability theorem asserts that the concept of truth in a language cannot be defined within that same language. For example, while we can talk about the truth of statements in English, we cannot construct a set of English sentences that perfectly capture what it means for an English sentence to be true. This suggests that any attempt to fully formalize the notion of truth will lead to limitations or contradictions. Essentially, truth is a concept that transcends the language in which we discuss it, highlighting fundamental limitations in our understanding and communication.