“The name zayin means ‘crown’…, ‘weapons’…and zun, ‘to sustain.’ In essence, these three definitions are interrelated.
…one of the things that tempts us during the work-week is our belief that it is our ability and efforts alone that shape and control our fate. This belief then opens the door to the evil inclination in all its facets.
Shabbos, the crown of Creation, is also the day that blesses and therefore sustains the following week.
By observing Shabbos, one accesses these blessings, which then gives us the weapon to overcome all negativity, especially the yetzer hara, the evil inclination.”