He had always been well aware of how easy it was to become complacent and forget things.
Very true, having a system & sticking to it verbatim is the best way to not make a mistake as your brain will recognize something is not right before you actually do. I did this at work when packing surgical instrument sets, & I made hardly any mistakes, when I did I was gutted & I think my bosses knew I hated it more than anything.
