The general procedure of Vedic marriage is that a father offers his daughter to a suitable boy. That is a very respectable marriage. A boy should not go to the girls father and ask for the hand of his daughter in marriage. That is considered to be humbling ones respectable position. Svayambhuva Manu wanted to convince Kardama Muni, since he knew that the sage wanted to marry a suitable girl: I am offering just such a suitable wife. Do not reject the offer, or else, because you are in need of a wife, you will have to ask for such a wife from someone else, who may not behave with you so well. In that case your position will be humbled.