It’s amazing, if you know what you want to say, how fast it is to write.

The remark underscores a practical truth about writing: speed and fluency are less a matter of typing quickly than of thinking clearly beforehand. If the writer has already settled the argument, structure, and key phrasing—often through planning, outlining, or simply having a well-formed idea—the act of drafting can feel surprisingly rapid. Implicitly, it also suggests that much of “writing” happens off the page: in preparation, reflection, and decision-making. The quote can be read as advice to focus on clarity of purpose and message, since uncertainty about what one wants to say is what typically slows writing down.