But only one thing is necessary. Mary has chosen the good portion, and it will not be taken away from her.” — Luke 10:42

One thing is needful. Martha was distracted with much serving, but Mary sat at Jesus' feet. Psalm 27:4 captures it: "One thing I have desired of the Lord—to behold the beauty of the Lord. For God like a deer for water. Jesus as the bread of life—whoever comes to Him will never hunger. All the activity in the world can't replace sitting at His feet.