In every deed or transaction a man performs by his own free will, be it
a matter of precept or of option, let the name of God be ready in his
mouth. If, for instance, he erects a building, or buys a vessel, or
makes a new garment, let him say with his mouth and utter with his lips,
"This thing I do, for (the honor of) the union of the Shechinah with the
Holy One--blessed be He!"
THE KABBALA, _Kitzur Sh'th_, fol. 7, col. 2.