This text is from the Psalm for Shabbat (the same one that ends with Tzadik Ka Tamar; it starts Mizmor Shir Le Yom Ha Shabbat).

The text itself reads: “Ma Gadlu MaAseh Adonoi, Meod AmKu MaHoshVotecha”, meaning “How vast are your works Adonoi, Your designs are beyond our grasp.”