Here's why it's so effective:
* Emphasis and Impact: Three items in a row create a sense of completeness and finality. It's like a drumbeat: "One, two, three... BAM!" The third element reinforces the message and leaves a lasting impression.
* Memorability: The repetition and structure of the rule of three make it easier for listeners and readers to remember the points being made.
* Rhythm and Flow: Three items create a pleasing rhythm and flow, making the writing or speech more enjoyable to consume.
* Clarity and Simplicity: Breaking information into three parts can make complex ideas easier to understand.
Examples:
* "Life, liberty, and the pursuit of happiness." (The Declaration of Independence)
* "I came, I saw, I conquered." (Julius Caesar)
* "Good, better, best. Never let it rest. 'Til your good is better and your better best." (A common saying)
So, the "rule of three" isn't about grammar, but about the art of persuasion and communication. It's a tool that writers and speakers can use to make their words more powerful and memorable.