Luke 10:42 Meaning

40But Martha was cumbered about much serving, and came to him, and said, Lord, dost thou not care that my sister hath left me to serve alone? bid her therefore that she help me.

41And Jesus answered and said unto her, Martha, Martha, thou art careful and troubled about many things:

42But one thing is needful: and Mary hath chosen that good part, which shall not be taken away from her.