I love these words of Jesus: "Martha, Martha, you are anxious and troubled about many things, but one thing is necessary." (Luke10:42) We have so many things to worry about. But Jesus said one thing is necessary. Given the context, we can see that one thing is to sit at the feet of Jesus and listen to his teaching. Our one thing is to know Jesus, love him and spend time in his presence. Everything else must "take a back seat".