John 20:1
“The first day of the week” (that is, the Lord's day) “comes Mary Magdalene, very early in the morning, and sees the stone taken away from the sepulcher.”
For He arose while both stone and seals lay over Him; but because it was necessary that others should be fully satisfied, the tomb was opened after the Resurrection, and thus what had come to pass was confirmed. This then was what moved Mary. For being entirely full of loving affection towards her Master, when the Sabbath was past, she could not bear to rest, but came very early in the morning, desiring to find some consolation from the place. But when she saw the place, and the stone taken away, she neither entered in nor stooped down, but ran to the disciples, in the greatness of her longing; for this was what she earnestly desired, she wished very speedily to learn what had become of the body. This was the meaning of her running, and her words declare it.
Source: Homilies on the Gospel of John (New Advent)