16 “And when she had so said, she went her way, and called Mary her sister silently, saying, The Master has come, and calls for you.” It is worthy of notice the way in which the whispering of her voice was denominated silence. For how could she be silent, when she said, “The Master has come, and calls for you”? It is also to be noticed why it is that the evangelist has not said where, or when, or how the Lord called for Mary; namely, that in order to preserve the brevity of the narrative, it may rather be understood from the words of Martha.
Source: Tractates on the Gospel of John (New Advent)