18 Moreover, also, (you say) there are many children at home; and the multitude of your children prevents you from giving yourself freely to good works. And yet on this very account you ought to labour the more, for the reason that you are the father of many pledges. There are the more for whom you must beseech the Lord. The sins of many have to be redeemed, the consciences of many to be cleansed, the souls of many to be liberated. As in this worldly life, in the nourishment and bringing up of children, the larger the number the greater also is the expense; so also in the spiritual and heavenly life, the larger the number of children you have, the greater ought to be the outlay of your labours.
Thus also Job offered numerous sacrifices on behalf of his children; and as large as was the number of the pledges in his home, so large also was the number of victims given to God. And since there cannot daily fail to be sins committed in the sight of God, there wanted not daily sacrifices wherewith the sins might be cleansed away. The Holy Scripture proves this, saying: “Job, a true and righteous man, had seven sons and three daughters, and cleansed them, offering for them victims to God according to the number of them, and for their sins one calf.” If, then, you truly love your children, if you show to them the full and paternal sweetness of love, you ought to be the more charitable, that by your righteous works you may commend your children to God.
Source: The Treatises of Cyprian (New Advent)