The Shabbos protects us in galus, because on Shabbos the Shechinah is with us.  Wherever Jews observe the Shabbos the kedusha of the Beis Hamikdash is present. Therefore, on Shabbos you should think of yourself as standing in the Beis Hamikdash.  You should be careful about what you are saying, and act with reverence and awe. ~ Yaaros Devash as quoted by R’ Dovid Meisels

For a beautiful rendition of Lecho Dodi, watch this video:

 https://www.youtube.com/watch?v=RWmcQpzUMHY