Whether matrimony is a sacrament?

Objections

Objection 1 : It would seem that matrimony is not a sacrament. For every sacrament of the New Law has a form that is essential to the sacrament. But the blessing given by the priest at a wedding is not essential to matrimony. Therefore it is not a sacrament.
Objection 2 : Further, a sacrament according to Hugh (De Sacram. i) is "a material element." But matrimony has not a material element for its matter. Therefore it is not a sacrament.
Objection 3 : Further, the sacraments derive their efficacy from Christ's Passion. But matrimony, since it has pleasure annexed to it, does not conform man to Christ's Passion, which was painful. Therefore it is not a sacrament.
Objection 4 : Further, every sacrament of the New Law causes that which it signifies. Yet matrimony does not cause the union of Christ with the Church, which union it signifies. Therefore matrimony is not a sacrament.
Objection 5 : Further, in the other sacraments there is something which is reality and sacrament. But this is not to be found in matrimony, since it does not imprint a character, else it would not be repeated. Therefore it is not a sacrament.