"Mary ... sat at the Lord’s feet, listening to what He said" (Luke 10:39).
What was the difference between Martha and Mary? Was it, "Martha did everything. Mary did nothing"?
No! There was something that Martha didn't do. She didn't sit at the Lord's feet and listen to what He said. There was something that Mary did do. What Martha didn't do was "the one thing" (Luke 10:42) that Mary did do. "Mary ... sat at the Lord's feet, listening to what He said."
Sitting at the Lord's feet, listening to what He says to us. Is this a waste of time? That's what some people tell us. It's not what Jesus tells us.
When Martha criticized Mary - "Martha was distracted by all the preparations that had to be made. She came to Him and asked, ‘Lord, don’t you care that my sister has left me to do the work by myself? Tell her to help me!’ (Luke 10:40), Jesus had an answer for her - ‘Martha, Martha,’ the Lord answered, ‘you are worried and upset about many things, but few things are needed – or indeed only one. Mary has chosen what is better, and it will not be taken away from her.’ (Luke 10:41-42).