Angels

For He shall give His angels charge over you, To keep you in all your ways (Psalm 91:11).

At that time Michael shall stand up, The great prince who stands watch over the sons of your people; And there shall be a time of trouble, Such as never was since there was a nation, Even to that time. And at that time your people shall be delivered, Every one who is found written in the book (Daniel 12:1).

The servants of Christ are protected by invisible, rather than visible, beings. But if these guard you, they do so because they have been summoned by your prayers.
~ St Ambrose

Angels mean messengers and ministers. Their function is to execute the plan of divine providence, even in earthly things.
~ St Thomas Aquinas

Everlasting God, you have ordained and constituted in a wonderful order the ministries of angels and mortals: Mercifully grant that, as your holy angels always serve and worship you in heaven, so by your appointment they may help and defend us here on earth; through Jesus Christ our Lord, who lives and reigns with you and the Holy Spirit, one God, for ever and ever. Amen.
~ Book of Common Prayer

The angels are the dispensers and administrators of the divine beneficence toward us; they regard our safety, undertake our defense, direct our ways, and exercise a constant solicitude that no evil befalls us.
~ John Calvin

If you pray truly, you will feel within yourself a great assurance: and the angels will be your companions.
~ Evagrius of Pontus

Unless otherwise noted, Scripture taken from the New King James Version®, NKJV © 1982 by Thomas Nelson.
Used by permission. All rights reserved.