Proverb.

Don't be worried about every little detail in your life. That's a sad attitude to go thru life with. That every little minor thing you do may ultimately harm others.

The English have a nursery rhyme about that, For Want Of A Nail. It's usually used to show that seemingly unimportant acts or omissions can have grave and unforeseen consequences through a domino effect. But I've heard even staunch utilitarians say that horrible attitude to go thru life with. And really that couldn't be true anyways. That lack of one nail caused a kingdom to fall. There was much more going on their than just that nail.