The Angels received at the beginning a knowledge of the Incarnation of the Divine Word. God revealed it to them when He required them to adore the Sacred Humanity of Jesus Christ. But they knew not all the circumstances that would accompany it. They did not know that He was to lead on earth a life of sorrow and to die a death of shame. These were revealed gradually and in part. We must rest content, as the Holy Angels do, to know just as much as God pleases and nothing more.

The Holy Angels have also an infused knowledge of human affairs. God reveals to them all that is necessary for the exercise of their guardianship of us, the dangers that we shall be exposed to, the temptations that will beset us, sometimes the secrets of our hearts. We should pray God that our Guardian Angels may know us very thoroughly, that so they may keep us in perfect safety.

The Angels understand far better than we do all the mysteries of grace. Why is this? It is because of their purity of heart. It is this that makes them full of light, and in virtue of this light they see far into the depths of the ways and works of God and His dealings with His creatures. We often are so dulled by earthly things and earthly passions that we seem to lose all appreciation of things Divine. It is the clean of heart to whom is granted the privilege of understanding the hidden things of God.