It's not quite a blog post, but it's as close as one might have come in 1908.
I also like a whole host of articles from Matt Might's blog. I think my favorites are
12 resolutions for grad students
http://matt.might.net/articles/grad-student-resolutions/
and Responding to peer review
http://matt.might.net/articles/peer-review-rebuttals/
One last essay that I have enjoyed, also too old to be a blog post, is W.M. Turski's "I was a computer". It's here on Elsevier but fortunately it looks to be open access.
https://www.sciencedirect.com/science/article/pii/0167642395...