Delete "must"

I got a lecture from a man of 102 years of age two days ago about the need to delete the word "must" (incl. "to have to") from our vocabulary because apparently it messes with our brains. (Not literally speaking...) It being severely disempowering, and giving wrong signal to brain of lack of choice in our lives, which has pretty dire spin-off effects... Makes sense to me. So I'll give it a try. Or try at least to use it very consciously! Good Luck to me...