/summa/XP/XPII/XP_Q53:
We must now consider the impediment of vows and orders. Under this head there are four points of inquiry:
(1) Whether a simple vow is a diriment impediment to matrimony?
(2) Whether a solemn vow is a diriment impediment?
(3) Whether order is an impediment to matrimony?
(4) Whether a man can receive a sacred order after being married?