29 Next I entreat you, by Him, from Whom you have both received this gift, and hope for the rewards of this gift, that you be mindful to set me also in your prayers with all your household Church. Forsooth it has come to pass in most proper order, that I should write unto your Mother now aged a letter concerning prayer; unto her, forsooth, it chiefly pertains by praying to contend on your behalf, who is less full of care for herself than for you; and that for you rather than for her I should compose this little work concerning widowed continence; because unto you it remains to overcome, what her age has already overcome. But the holy virgin your child, if she desire anything concerning her profession from our labors, she has a large book on Holy Virginity to read. Concerning the reading of which I had also admonished you, forasmuch as it contains many things necessary unto either chastity, that is, virginal and widowed, which things on this account I have here partly touched on lightly, partly altogether passed over, because I there discussed them more fully.
May you persevere in the grace of Christ.
Source: On the Good of Widowhood (New Advent)