1. If anyone denies that the body and blood, together with the soul and divinity, of our Lord Jesus Christ and, therefore, the whole Christ is truly, really, and substantially contained in the sacrament of the most holy Eucharist, but says that Christ is present in the Sacrament only as in a sign or figure, or by his power: let him be anathema.
2. If anyone says that the substance of bread and wine remains in the holy sacrament of the Eucharist together with the body and blood of our Lord Jesus Christ, and denies that wonderful and extraordinary change of the whole substance of the bread into Christ's body and the whole substance of the wine into his blood while only the species of bread and wine remain, a change which the Catholic Church has most fittingly called transubstantiation: let him be anathema.
--The Council of Trent (1545-1563)