This quote is highlighting the importance of measuring and how it can provide concrete answers to questions that might seem uncertain or speculative. The example used is dragons, and the quote poses the questions of their existence and size. The point being made is that once you use measurement to determine the size of an object or creature, you no longer have to wonder or speculate about it. Measuring provides a concrete answer that can be trusted, unlike guessing or assuming. Therefore, the quote suggests that measuring is a reliable tool that can help us better understand the world around us.
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