Angels are servants and messengers from God. "Angel" in Greek means messenger. In unseen ways the angels help us on our earthly pilgrimage by assisting us in work and study, helping us in temptation and protecting us from physical danger.
The idea that each soul has assigned to it a personal guardian angel has been long accepted by the Church and is a truth of our faith. From the Gospel of today's liturgy, we read: "See that you do not despise one of these little ones, for I say to you that their angels in heaven always look upon the face of my heavenly Father" (Matthew 18:10). The Catechism of the Catholic Church states that "the existence of the spiritual, non-corporeal beings that Sacred Scripture usually calls 'angels' is a truth of faith (328)." From our birth until our death, man is surrounded by the protection and intercession of angels, particularly our guardian angel: "Beside each believer stands an angel as protector and shepherd leading him to life (336)."
O God, who in your unfathomable providence are pleased to send your holy Angels to guard us, hear our supplication as we cry to you, that we may always be defended by their protection and rejoice eternally in their company.
The photo is of one of the many stained glass windows in the Cathedral depicting angels. In the photo, the angel is holding a medallion with the Eye of God depicted in the center.
The Eye of God, also known as the Eye of Providence, is an equilateral triangle with a single eye inside it, with rays emanating from it.
It symbolizes the omnipresence and omniscience of God, who watches over all things. It is also associated with the Trinity (which the triangle symbolizes in itself).