Saint Bernard's Meditation on the Guardian Angels. Here's what it says

Guard you in all your steps
he will order his angels to guard you in all your steps. " These words how much reverence they must arouse in you, how much devotion to you, how much confidence to instill in you! Reverence for presence, devotion for benevolence, trust for custody. They are present, therefore, and they are present to you, not only with you, but also for you. They are present to protect you, they are present to benefit you.
Even though angels are mere executors of divine commands, one must be grateful to them too because they obey God for our good.
We are therefore devoted, we are grateful to such great protectors, let us give them back, honor them as much as we can and how much we must.
All love and all honor go to God, from whom it derives entirely what belongs to the angels and what belongs to us. From him comes the ability to love and honor, from him what makes us worthy of love and honor.
We love the angels of God affectionately, like those who will one day be our co-heirs, while in the meantime they are our guides and tutors, constituted and appointed to us by the Father. Now, in fact, we are children of God. We are, even if we do not currently understand this clearly, because we are still children under administrators and tutors and, consequently, we do not differ at all from the servants. After all, even if we are still children and we still have such a long and dangerous journey, what should we fear under such great protectors?
They cannot be defeated or seduced let alone seduce them, who guard us in all our ways. They are faithful, they are prudent, they are powerful. Why anxious? Just follow them, stay close to them and stay in the protection of the God of heaven.