Swiping material, using it in your manuscript and not crediting who originally wrote such material is called plagiarism, and no self-respecting writer should do that.
Writers, CITE your source material.
KNOW the rules of Fair Use when it comes to material.
UNDERSTAND copyright laws/rules.
Don’t pass off quotes as yours.
Don’t swipe articles off the internet and pass them off as yours, either. That’s STEALING!
This is elementary stuff. It’s the basics. You should KNOW better. Don’t think your editor won’t catch you at it or call you on it, because he/she WILL!