I like to quote the Bible, - - - it is the best Reality Check that I know of.
It is true that we can add nothing to, nor take anything away from God. I that sense, God will always be God despite anything that I do or say.
However, as you say, scripture is the basis for what we believe. And if Jesus thought the Sermon on the Mount was important to impart to us, then then the joy of His children is important to God. At the same time, the direction to worship only Him, is evidence that it’s important that God be glorified.