St. Alphonsus Liguori
“St. John says that he saw our Lord girt up with a golden girdle, which supported His breasts: ‘I saw the Son of Man girt about the paps with a golden girdle’ (Apoc. i. 12, 13). Thus also is Jesus in the Sacrament of the Altar, with His breasts all filled with milk; that is to say, with the graces which, in His mercy, He desires to bestow upon us. And as a mother, whose breasts are over charged with milk, goes about seeking for children who may draw it off, and relieve her of its weight, so also does He call out to us, ‘You shall be carried at the breasts’ (Is. lxvi. 12).”
Source: St. Alphonsus Liguori, Visits to the Most Holy Sacrament