133. The Lights of Shabbat
The Lights of Shabbat come to the discernment of the Guf (body). Hence, on Shabbat we say, “A Psalm of David. Bless the Lord, O my soul; and all that is within me,” meaning the Guf. A new head, however, is considered a Neshama (soul), which comes only to the discernment of the Neshama and not to the Guf. This is why we only say, “Bless the Lord, O my soul,” and not “and all that is within me,” since they do not reach the Guf (see Zohar 1,97).