Not sure it’s a blog post really but I saw a video of Rutger Bregman talking about moral ambition and it directly led to me applying at a non-profit that was better aligned with my own ideals and leaving my job at a pretty large and morally reprehensible corporation.
I used to follow Windows beta builds and read the blog posts covering each release. Those articles, along with experimenting with the beta versions themselves, had a big influence on the direction I eventually took as a programmer.
5 Ways You're Sabotaging Your Own Life (Without Knowing It)