In the text, we see Jesus invite Martha to believe in Him. Her response shows clearly that she—like her sister Mary (see Luke 10:41)—has come to know in a very deep way the "one thing necessary."
From the Gospel for the feast of Saints Martha, Mary, and Lazarus (July 29):
From the Gospel for the feast of Saints Martha, Mary, and Lazarus (July 29):
“And many of the Jews had come to Martha and Mary to comfort them about their brother.
“When Martha heard that Jesus was coming, she went to meet him; but Mary sat at home. Martha said to Jesus, ‘Lord, if you had been here, my brother would not have died. [But] even now I know that whatever you ask of God, God will give you.’
“Jesus said to her, ‘Your brother will rise.’ Martha said to him, ‘I know he will rise, in the resurrection on the last day.’
“Jesus told her, ‘I am the resurrection and the life; whoever believes in me, even if he dies, will live, and everyone who lives and believes in me will never die. Do you believe this?’
“She said to him, ‘Yes, Lord. I have come to believe that you are the Messiah, the Son of God, the one who is coming into the world.’”
~John 11:19-27