Jesus tells her that Lazarus will rise again. Martha responds that she already knows about future resurrections. Jesus says to her, "I am the resurrection and the life. Those who believe in me, even though they die, will live, and everyone who lives and believes in me will never die."
Then he asks her the question, "Do you believe this?" She responds, "Yes, Lord, I believe that you are the Messiah, the Son of God, the one coming into the world."
Martha believes based on what Jesus has told her. She already believes although she is speaking at a time when Lazarus is still in the tomb. She is speaking when Jesus' death and resurrection have not yet ocurred.
Martha goes back to the house to tell Mary that Jesus wants to speak to her. When Mary rushes out of the house, the mourners there follow her because they think she is going to the tomb.
When Mary sees Jesus, she also says to him, "If you had been here, my brother would not have died." When Jesus saw her weeping and saw the mourners who had come with her also weeping, he was deeply moved. He asked, "Where have you laid him?"
Charles Cousar, in Texts for Preaching, A Lectionary Commentary based on the NRSV-Year A, says:
He "was greatly disturbed in spirit and deeply moved (11:33, 38). The Greek terms carry the notion of anger and distress. It is more than a statement of Jesus' empathy with grieving friends. He is troubled. He perceives the evidences of death all about and knows that its power is still very much in place. He sees the sharp opposition that cannot tolerate the giving of life, the religious authorities who are threatened by his transforming deeds....
