This tender and playful little letter, with its childlike simplicity of fancy and gentle authority of tone, encourages us to believe that Catherine appreciated the full advantages of being an aunt. We have other indications that the many spiritual ties which held her as she grew older never weakened the bond of any natural affection. Indeed, Catherine re- created each natural bond, when possible, as a spiritual bond, an achievement none too common. Doubtless, many children grew up around her in the large Benincasa household. We know that at the time of the plague, in 1374, Lapa was bringing up eleven grandchildren in her own house. Of these, eight fell victims to the pestilence, and we have a glimpse of Catherine burying them with her own hands, and saying as she laid them to rest one by one, "This one, at least, I shall not lose." Of the little Nanna to whom this letter was written we know nothing, except that she was the child of the elder brother, who, as we have already seen, had moved to Florence.

In the Name of Jesus Christ crucified and of sweet Mary:

Dearest daughter in Christ sweet Jesus: I Catherine, servant and slave of the servants of Jesus Christ, write to thee in His precious Blood, with desire to see thee a real bride of Christ crucified, running away from everything which might hinder thee from possessing this sweet and glorious Bridegroom. But thou couldst not do this if thou wert not among those wise virgins consecrated to Christ who had lamps with oil in them, and light was within. See, then, if thou wishest to be a bride of Christ, thou must have lamp, and oil, and light. Dost thou know what this means, daughter mine? By the lamp is meant our heart, because a heart ought to be made like a lamp. Thou seest that a lamp is wide above and narrow below, and so the heart is made, to signify that we ought always to keep it wide above, through holy thoughts and holy imaginations and continual prayer; always holding in memory the blessings of God, and chiefly the blessing of the Blood by which we are bought. For Blessed Christ, my daughter, did not buy us with gold or silver or pearls or other precious stones; nay, He bought us with His precious Blood. So one wants never to forget so great a blessing, but always to hold it before one's eyes, in holy and sweet gratitude, seeing how immeasurably God loves us: who did not shrink from giving His only begotten Son to the opprobrious death of the Cross, to give us the life of grace.

I said that a lamp is narrow below, and so is our heart: to signify that the heart ought to be narrow toward these earthly things -- that is, it must not desire nor love them extravagantly, nor hunger for more than God wills to give us; but ever thank Him, seeing how sweetly He provides for us so that we never lack anything.

Now in this way, our heart will really be a lamp. But reflect, daughter mine, that this would not be enough were there no oil within. By oil is meant that sweet little virtue, profound humility: for it is fitting that the bride of Christ be humble and gentle and patient; and she will be as humble as she is patient, and as patient as she is humble. But we cannot attain this virtue of humility except by true knowledge of ourselves, knowing our misery and frailty, and that we by ourselves can do no good deed, nor escape any conflict or pain; for if we have a bodily infirmity, or a pain or conflict in our minds, we cannot escape it or remove it -- for if we could we should escape from it swiftly. So it is quite true that we in ourselves are nothing other than infamy, misery, stench, frailty, and sins; wherefore, we ought always to abide low and humble. But to abide wholly in such knowledge of one's self would not be good, because the soul would fall into weariness and confusion; and from confusion it would fall into despair: so the devil would like nothing better than to make us fall into confusion, to drive us afterward to despair. We ought, then, to abide in the knowledge of the goodness of God in Himself, perceiving that He has created us in His image and likeness, and re-created us in grace by the Blood of His only-begotten Son, the sweet incarnate Lord; and reflecting how continually the goodness of God works in us. But see, that to abide entirely in this knowledge of God would not be good, because the soul would fall into presumption and pride. So it befits us to have one mixed with the other -- that is, to abide in the holy knowledge of the goodness of God, and also in the knowledge of ourselves: and so we shall be humble, patient, and gentle, and in this way we shall have oil in our lamp.

Now, then, we must have light -- otherwise it would not be enough. This light has to be the light of most holy faith. But the saints say that faith without works is dead, so our faith might be neither living nor holy, but dead. Therefore we need to exert ourselves virtuously all the time, and leave our childishness and vanities, and not behave any longer like worldly girls, but like faithful brides consecrated to Christ crucified; in this way we shall have a lamp, and oil, and light.

The Gospel says that these wise virgins were five. So I tell thee that there must be five in each of us -- otherwise we shall not enter the wedding feast of eternal life.

By these five it is meant that we must subject and mortify our five bodily senses, in such wise that we may never offend with them, taking through them or some of them unregulated pleasure or delight. In this way we shall be five, when we have subdued our five senses.

But think that that sweet Bridegroom Christ is more jealous of His brides than I could tell thee! Therefore if He should see that thou didst love anyone more than Him, He would be angry with thee at once. And if thou didst not correct thyself, the door would not be open to thee, to the wedding feast which Christ the Lamb without spot holds for all His faithful: but we should be driven away like bad women, as those five foolish virgins were, who, glorying only and vainly in the integrity and virginity of their body, lost the virginity of their soul, through the corruption of the five senses, because they did not carry the oil of humility with them, so that their lamps went out. Therefore it was said to them: "Go hence to buy oil." By this oil is meant in this place the flatteries and praises of men; since all the flatterers and praisers of the world sell this oil. As if it were said to them: "You have not wanted to buy eternal life with your virginity and your good works; no, you have wanted to buy the praises of men, and to have the praises of men you have wrought. Go now and buy praises, for you will not enter here." Therefore, daughter mine, beware of the praises of men; and do not want praise for any work that thou mayest do, for the door of eternal life would not be open to thee later.

So, reflecting that this was the best way, I said that I desired to see thee a real bride of Christ crucified; and so I beg and command thee that thou try hard to be. I say no more to thee. Remain in the holy and sweet grace of God. Sweet Jesus, Jesus Love.