Saint Peter of Alcantara often preached to Poor Clare nuns, offered Holy Mass, and  served their spiritual needs. He wrote:
“Jesus wished to reassure His spouse, [the Church], … that she might traverse joyfully the toiling bitterness of life: and that she might hold as certain this hope of blessedness, He left her this ineffable Treasure as a pledge of all she hopes for.”                               
                        – Saint Peter of Alcantara, referring to the Blessed Sacrament,                  
                            found in A Treatise on Prayer, by St. Peter of Alcantara, Part   
                                                                                                                  I, ch. 4