29 With great wisdom Our predecessor Leo XIII, of happy memory, in the Encyclical on Christian marriage which We have already mentioned, speaking of this order to be maintained between man and wife, teaches: "The man is the ruler of the family, and the head of the woman; but because she is flesh of his flesh and bone of his bone, let her be subject and obedient to the man, not as a servant but as a companion, so that nothing be lacking of honor or of dignity in the obedience which she pays. Let divine charity be the constant guide of their mutual relations, both in him who rules and in her who obeys, since each bears the image, the one of Christ, the other of the Church."
Source: Casti Connubii (Vatican.va)