Quesion: How did Mary know that Jesus was God and could perform a miracle at Cana?
During the Annunciation, the angel tells Mary that her son will be the “Son of the Most High” (Luke 1:32). From the beginning, then, Mary knew that her son was destined for greatness. At the wedding at Cana, she brings a problem to him and is confident that he’ll be able to resolve it (John 2: 1-12).
As a mom, I can relate. Being a mom means having faith that your children will be able to do things they’ve never done before, whether it’s walk, read, or ride a bike. You’ve never seen them do these things, but you know that they will when the time is right. Often, too, a mom’s encouragement is key to their success.
At Cana, then, Mary is a typical mom, but with a twist. She believed that her child could do something that no child has ever done, before or since. As the National Conference of Catholic Bishops say in their letter Behold Your Mother: Woman of Faith,
“It is striking that no sign is done to help Mary believe. The Mother of Jesus requires no miracle to strengthen her faith.”