Luke 2:35

But the evil thoughts of men were revealed, that He Who died for us might slay them; for while they were hidden, it was impossible to utterly destroy them. Hence also when we have sinned we ought to say, Mine iniquity have I not hid. (Ps. 32:5.) For if we make known our sins not only to God, but to whoever can heal our wounds, our sins will be blotted out.

(non occ.) Though these things are said of the Son, yet they have reference also to His mother, who takes each thing to herself, whether it be of danger or glory. He announces to her not only her prosperity, but her sorrows; for it follows. And a sword shall pierce through thy own heart. (de occ. Dom. non occ.) But it is not meant that she alone was concerned in that passion, for it is added, that the thoughts of many hearts may be revealed. The word that marks the event; it is not used causatively; for when all these events took place, there followed the discovery of many men's intentions. For some confessed God on the cross, others even then ceased not from their blasphemies and revilings. Or this was said, meaning that at the time of the passion the thoughts of men's hearts should be laid open, and be corrected by the resurrection. For doubts are quickly superseded by certainty. Or perhaps by revealing may be meant, the enlightening of the thoughts, as it is often used in Scripture.

Or it shows the wisdom of Mary, that she was not ignorant of the heavenly Majesty. For the word of God is living and strong, and sharper than the sharpest sword. (Heb. 4:12.)

(de Nov. ac vet, Test. c. 73.) Or by this is signified that Mary also, through whom was performed the mystery of the incarnation, looked with doubt and astonishment at the death of her Lord, seeing the Son of God so humbled as to come down even to death. And as a sword passing close by a man causes fear, though it does not strike him; so doubt also causes sorrow, yet does not kill; for it is not fastened to the mind, but passes through it as through a shadow.

No history tells us that Mary departed this life by being slain with the sword, therefore since not the soul but the body is killed with iron, we are left to understand that sword which is mentioned, And a sword in their lips, (Ps. 59:7.) that is, grief because of our Lord's passion passed through her soul, who although she saw Christ the very Son of God die a voluntary death, and doubted not that He who was begotten of her flesh would overcome death, could not without grief see Him crucified.