In the next place we must consider matrimony. We must treat of it: (1) As directed to an office of nature; (2) As a sacrament; (3) As considered absolutely and in itself.

Under the first head there are four points of inquiry:

(1) Whether it is of natural law?

• (2) Whether it is a matter of precept?
• (3) Whether its act is lawful?
• (4) Whether its act can be meritorious?