![source: Wikimedia Commons Portrait of William Thomson, Lord Kelvin](https://platonicrealms.com/sites/default/files/images/prime/portraits/kelvin.jpg)
William Thomson, Lord Kelvin
1824–1907
Irish mathematical physicist
Mathematics is the only good metaphysics.
TOPICS: philosophy
When you can measure what you are talking about and express it in numbers, you know something about it.
TOPICS: numbers, knowledge