They shall rejoice in Your Kingship - those who observe the Sabbath - and call it a delight. The people that sanctifies the seventh - they will all be satisfied and delighted with Your goodness. And the Seventh - You found favor in it and sanctified it. ’Most coveted of days,” You called it, a remembrance of creation. (Tefillas Shabbos Kodesh)
Yismichu Bimalchuschoh - Shomrei Shabbos, the beginning point of those who rejoice in the Kingship of Hashem, is Shomrei Shabbos – those who observe the day of Shabbos and keep all its commandments. A step higher is Vikorei Oneg – those who call it a delight. Even greater is Am Mikadshei Sheviyi - Those who make Heilig (holy) the Shabbos. Even so, Kulom yisbi’u visangu MiTovechoh - they will all be satisfied and delighted with Your goodness!
- Rav Avrohom Elimelech of Karlin