Summa Theologica

We have now to consider the sacrament of the Eucharist; and first of all we treat of the sacrament itself; secondly, of its matter; thirdly, of its form; fourthly, of its effects; fifthly, of the recipients of this sacrament; sixthly, of the minister; seventhly, of the rite.

Under the first heading there are six points of inquiry:

(1) Whether the Eucharist is a sacrament?

(2) Whether it is one or several sacraments?

(3) Whether it is necessary for salvation?

(4) Its names;

(5) Its institution;

(6) Its figures.