Grammar is the way words are organized into speech and writings so as to get across exact thoughts, ideas and meanings between people. It is really the agreements between people so that real communication is had.
Grammar is formed by common usage and forwarded to all by writers.
Words ARE NOT the thing itself; they are just substitutes for things, the concepts, or ideas of things.
Words don’t hurt you. They don’t love you. They only get you to do or think or feel something. The word “fire” is nothing to be afraid of; it won’t pop up on the page and burn you. They get you to remember things in the past that did hurt or love you.
Words and Grammar are only there to HELP you the reader and writer. They are not as important as having the ideas themselves.