12 The Feast which the Church keeps today recalls to Us, as a fitting end to these Our exhortations, those moving words of Jesus Who, after having (as St. John Chrysostom expresses it) built up impregnable ramparts around the souls of the little ones, added: "See that you despise not one of these little ones, for I say to you that their angels in heaven behold always the face of my Father Who is in heaven" ( Matt. xviii, 10). Assuredly, those will be the selfsame angels who, in heaven, will present to the Lord all the acts of charity wrought by generous hearts on behalf of little children, and they, in their turn, will obtain abundant blessings for those who have spent themselves in so holy a cause.
Source: Nova Impendet (Vatican.va)