69. The homily, which is obligatory, will have as its centre the presentation of the "great mystery" being celebrated before God, the Church and society. "Saint Paul uses a concise phrase in reference to family life: it is a great mystery (Ephesians 5: 32)". (Gratissimam Sane, 19). Beginning with the proclaimed texts of the Word of God andor the liturgical prayers, light should focus on the sacrament, hence the consequences for the life of the spouses and their families should be illustrated. Superfluous personal references to the spouses should be avoided.