Hot take: I stopped assuming the first part off a new program was good to go
I used to run the first piece from a fresh program and call it done if it looked okay... saved time on checks. Then a whole batch had a hidden depth error because I didn't measure after the initial cut. Now I always probe the first piece fully, even if it slows me down... what habit shift saved your bacon recently?
Solid saying, and it works because blind trust gets you burned every time. That check step saves a lot of headaches down the road. It's just good practice for anything, really.
Totally get that saying. It's saved me more than once, like when I lent my car to a friend and double-checked the insurance was up to date. That little step avoided a huge mess later. Really is the best way to handle things without being paranoid.