St. Thomas Aquinas
“The blood of Christ’s Passion has its efficacy not merely in the elect among the Jews, to whom the blood of the Old Testament was exhibited, but also in the Gentiles; nor only in priests who consecrate this sacrament, and in those others who partake of it; but likewise in those for whom it is offered. And therefore He says expressly, ‘for you,’ the Jews, ‘and for many,’ namely the Gentiles; or, ‘for you’ who eat of it, and ‘for many,’ for whom it is offered.”
Source: St. Thomas Aquinas, Summa Theologica