45 The Council of Trent, basing itself on this faith of the Church, "openly and sincerely professes that after the consecration of the bread and wine, Our Lord Jesus Christ, true God and man, is really, truly and substantially contained in the Blessed Sacrament of the Holy Eucharist under the outward appearances of sensible things." And so Our Savior is present in His humanity not only in His natural manner of existence at the right hand of the Father, but also at the same time in the sacrament of the Eucharist "in a manner of existing that we can hardly express in words but that our minds, illumined by faith, can come to see as possible to God and that we must most firmly believe." (49)
Source: Mysterium Fidei (Vatican.va)