PROGRAMMERS SHOULD NEVER TRUST ANYONE, NOT EVEN THEMSELVES

Summary from the TLDR Web Dev newsletter

Programmers should embrace a mindset of skepticism and constant verification, as trusting abstractions can lead to unexpected problems. Abstractions, while necessary for efficient thinking, are often leaky and can fail in unpredictable ways, so it's important to understand the underlying mechanisms. That's why "trust, but verify” is necessary when working on a project with a lot of abstractions.