Asking for a "great example" of punctuation use - any punctuation - is to miss the point, which is to smooth the reader's understanding of the text in the way that inflection and cadence are used in speech. As another commenter pointed out, well-used punctuation should be invisible. Only in its absence can it be properly appreciated.
Understanding language is not a strictly linear, one-word-after-another process, and these non-lexical clues all help us converge quickly on the intended meaning.
There have been several suggestions as to what might be just as good as a semicolon, but the period is a new one to me, and I strongly suspect that there are many cases where this substitution would interrupt a reader's flow. Given the importance, semantically, of the sentence, there are probably cases where this would corrupt the meaning.