The Gemara tells us the Song of the Day for Monday is Shir Mizmor Livnei Korach (Psalm 48) because the heavens and earth were separated and G-d ruled over both of them on the Second Day. Nevertheless, the psalm mentions Yerushaliyim because it is the seat of His holiness.
4. Be kind to yourself. Speaking badly even about yourself is unethical.
הלכות שמירת הלשון 