13 For after the vision of the Angels, Jesus came as His own Herald; and the Gospel says, And behold Jesus met them, saying, All hail! And they came and took hold of His feet. They took hold of Him, that it might be fulfilled, I will hold Him, and will not let Him go. Though the woman was weak in body, her spirit was manful. Many waters quench not love, neither do rivers drown it; He was dead whom they sought, yet was not the hope of the Resurrection quenched.
And the Angel says to them again, Fear not ye; I say not to the soldiers, fear not, but to you; as for them, let them be afraid, that, taught by experience, they may bear witness and say, Truly this was the Son of God; but you ought not to be afraid, for perfect love casts out fear. Go, tell His disciples that He is risen; and the rest. And they depart with joy, yet full of fear; is this also written? yes, the second Psalm, which relates the Passion of Christ, says, Serve the Lord with fear, and rejoice unto Him with trembling — rejoice, because of the risen Lord; but with trembling, because of the earthquake, and the Angel who appeared as lightning.
Source: Catechetical Lectures (New Advent)