Two more questions in the spirit of the previous post.
Mizmor shir li'yom ha'shabbos - That's the title of the chapter. Then - NOT A WORD ABOUT SHABBOS. Sorta like sending an email with a subject on top and then the email has NOTHING to do with the subject.
Strange.
Li'dovid Hashem Ori Vi'yishi - We read it every day of Elul at the end of davening after we blow the shofar. Elul and the shofar are supposed to instill fear in us. The theme of Li'dovid Hashem is "DON'T FEAR, EVERYTHING WILL BE OK".
Strange.