Guarding the Shabbos from forces of evil:

In addition to the command to make the Shabbos, as explained above, we are also committed to guard the Shabbos. This means that we are commanded to prevent any forces of evil from nurturing from the great revelation of the level of supernal pleasure within supernal wisdom that takes place on Shabbos. [All the laws of guarding the Shabbos were established for this purpose and one who breaks any of the laws causes and allows the forces of evil to nurture from this great revelation.]

Torah Or p. 69b-70b