http://www.newadvent.org/summa/109201.htm
“Subjection is twofold. One is servile, by virtue of which a superior makes use of a subject for his own benefit; and this kind of subjection began after sin. There is another kind of subjection which is called economic or civil, whereby the superior makes use of his subjects for their own benefit and good; and this kind of subjection existed even before sin. For good order would have been wanting in the human family if some were not governed by others wiser than themselves. So by such a kind of subjection woman is naturally subject to man,
because in man the discretion of reason predominates.”
http://www.newadvent.org/summa/317702.htm
Speech may be employed in two ways: in one way privately, to one or a few, in familiar conversation, and in this respect the grace of the word may be becoming to women; in another way, publicly, addressing oneself to the whole church, and this is not permitted to women. First and chiefly, on account of the condition attaching to the female sex, whereby woman should be subject to man, as appears from Gn. 3:16. Now teaching and persuading publicly in the church belong not to subjects but to the prelates (although men who are subjects may do these things if they be so commissioned, because their subjection is not a result of their natural sex, as it is with women, but of some thing supervening by accident). Secondly, lest men’s minds be enticed to lust, for it is written (Sirach 9:11): “Her conversation burneth as fire.” Thirdly, because as a rule
women are not perfected in wisdom, so as to be fit to be intrusted with public teaching.
“Certain things are required in the recipient of a sacrament as being requisite for the validity of the sacrament, and if such things be lacking, one can receive neither the sacrament nor the reality of the sacrament. Other things, however, are required, not for the validity of the sacrament, but for its lawfulness, as being congruous to the sacrament; and without these one receives the sacrament, but not the reality of the sacrament. Accordingly we must say that the male sex is required for receiving Orders not only in the second, but also in the first way. Wherefore even though a woman were made the object of all that is done in conferring Orders, she would not receive Orders, for since a sacrament is a sign, not only the thing, but the signification of the thing, is required in all sacramental actions; thus it was stated above (32, 2) that in Extreme Unction it is necessary to have a sick man, in order to signify the need of healing.* Accordingly, since it is not possible in the female sex to signify eminence of degree, for a woman is in the state of subjection*, it follows that she cannot receive the sacrament of Order . . .
Summa Theologica Suppl. qu. 39 art. 1
I answer that, It was necessary for woman to be made, as the Scripture says, as a “helper” to man; not, indeed, as a helpmate in other works, as some say,* since man can be more efficiently helped by another man in other works*; but as a helper in the work of generation . . . .
Among perfect animals the active power of generation belongs to the male sex, and the passive power to the female. And as among animals there is a vital operation nobler than generation, to which their life is principally directed; therefore the male sex is not found in continual union with the female in perfect animals, but only at the time of coition; so that we may consider that by this means the male and female are one, as in plants they are always united; although in some cases one of them preponderates, and in some the other.
*But man is yet further ordered to a still nobler vital action, and that is intellectual operation. Therefore there was greater reason for the distinction of these two forces in man; so that the female should be produced separately from the male; although they are carnally united for generation. *Therefore directly after the formation of woman, it was said: “And they shall be two in one flesh” (Gn. 2:24).
Summa Theologica I, qu. 92, art. 1.
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