"How do we define this fundamental quantity? The Greek etymology is clear. [[Aristotle]], writing in his Metaphysics, combined ἐν (in) with ἔργνο (work) and concluded that every object is maintained by [[ἐνέργεια]]." ([Location 578](https://readwise.io/to_kindle?action=open&asin=B08SGC3TD3&location=578)) --- **Tags** -- [[quotes]], [[Greek]], **Source** --