THIRD PART (TP) OF THE SUMMA THEOLOGICA
Forasmuch as our Saviour the Lord Jesus Christ, in order to "save His
people from their sins" (Mt. 1:21), as the angel announced, showed unto
us in His own Person the way of truth, whereby we may attain to the bliss
of eternal life by rising again, it is necessary, in order to complete
the work of theology, that after considering the last end of human life,
and the virtues and vices, there should follow the consideration of the
Saviour of all, and of the benefits bestowed by Him on the human race.
Concerning this we must consider (1) the Saviour Himself; (2) the
sacraments by which we attain to our salvation; (3) the end of immortal
life to which we attain by the resurrection.
Concerning the first, a double consideration occurs: the first, about
the mystery of the Incarnation itself, whereby God was made man for our
salvation; the second, about such things as were done and suffered by our
Saviour---i.e. God incarnate.