If there is any error on the part of those contracting marriage, is the consent, which makes the marriage, invalid?
If this error touches the person of either party the marriage is null; but if it touches the qualities of the person it is illicit (Code, Canon 5083).
Is it a good thing on the occasion of the celebration of marriage for the contracting parties to assist at a special Mass in which their union is blessed by the priest?
Yes; and the Church wishes that all her children before receiving this great sacrament in which a special grace is conferred on them that they might fulfil the duties of their married life, should dispose themselves to receive this grace in all its fulness by a good confession and a fervent communion (Code, Canon 1101).
Next - The Catechism of the Summa - Tertia Pars - XLIII. OF THE SACRAMENT OF MATRIMONY; OF ITS NATURE, IMPEDIMENTS, DUTIES; OF DIVORCE; OF SUBSEQUENT MARRIAGE; AND OF ESPOUSALS (H)