John 20:11

But Mary stood without at the sepulchre weeping. Because she anxiously looked about on every side for the Body of Jesus, as glowing in love for Him, and was beside herself; and not finding Him, wept for grief. "The eyes (says S. Augustine in loc.) who sought, but found Him not, had leisure to weep, and sorrowed more for His being taken from the tomb than that He had died on the Cross, because not even a memorial remained of so great a Teacher, whose life had been taken away."

And as she wept, she stooped down, and looked into the sepulchre. Though she looked in before and saw that the sepulchre was empty. For, as says S. Gregory (in loc.), "A single look suffices not one who loves. The power of love increases the earnestness of the inquiry: she persevered in seeking, and accordingly she found. And so it was that her desires expanded and increased, and could thus take in that which they found." Ver. 12. And saw two angels in white sitting, the one at the head, and the other at the feet, where the body of Jesus had lain. All these were tokens of His glorious Resurrection, and prepared the mind of the Magdalene to believe it. One sat at the head and the other at the feet, to signify that the whole Body of Christ had risen, and that, by assuming the immortal form and glory of angels, He had entered into their company, and had left these two angels, as guardians of the tomb, to announce the fact to the Magdalene.

Origen says that, mystically, the angel at the feet represented the active, the angel at the head the contemplative, life. For they are both of them from Jesus, about Jesus, through Jesus, and on account of Jesus. Ver. 13. They say unto her, Woman, why weepest thou? This is no place for weeping, but rather for rejoicing, and being glad. Because thou seest not here the dead Body of thy Beloved One, thou oughtest to infer that Jesus has risen, and is no longer among the dead, but among the living; and more than this, that He is passing a blessed and heavenly life among the glorious angels, such as we are ourselves.

She saith unto them, Because they have taken away my Lord, and I know not where they have laid him. I weep for three reasons. (1.) Because of the ignominious death of my Lord. (2.) Because His Body has been taken away, for if I saw It, I should kiss It, lament over It, and anoint It. (3.) Because I do not know where to look for It. For did I know, I should haste to the spot, embrace It, and overwhelm It with kisses. See here how Jesus suffers the souls of those that love Him to remain in ignorance for a while, in order to sharpen and enkindle their desire for Him; and when it is thus sharpened and enkindled, to comfort and make them glad with the full revelation of Himself.