Mary knew that hearing Jesus' words was the most important need of her life. Jesus recognized this when he reminded Martha that while her time was taken up with many things, only what Mary had chosen was necessary. Jesus knew the importance of the spiritual over the physical - taking time to fast and pray, discerning who to heal and who to pass by, and choosing where and how to best spend each day of his lfe. We can only know what truly needs to be done through communing with the Father on a daily basis. But nothing, no matter how pressing or important, should take our focus from Christ.
“Therefore I tell you, do not worry about your life, what you will eat or drink; or about your body, what you will wear. Is not life more than food, and the body more than clothes? But seek first the kingdom of God and his righteousness, and all these things will be added to you. Therefore do not be anxious about tomorrow, for tomorrow will be anxious for itself. Sufficient for the day is its own trouble.” - Matthew 6:25, 33-34