Quote about knowledge

I've been looking for this quote for a while. I like it because it explains why I like measuring things.

When you can measure what you are speaking about, and express it in numbers, you know something about it, when you cannot express it in numbers, your knowledge is of a meager and unsatisfactory kind; it may be the beginning of knowledge, but you have scarely, in your thoughts advanced to the stage of science.

— William Thomson Kelvin