38 Now it came to pass, as they went, that he entered into a certain village: and a certain woman named Martha received him into her house.
39 And she had a sister called Mary, which also sat at Jesus' feet, and heard his word.
40 But 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.
41 And Jesus answered and said unto her, Martha, Martha, thou art careful and troubled about many things:
42 But one thing is needful: and Mary hath chosen that good part, which shall not be taken away from her.
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How many reasons there are for people to be divided... The Gospel of Luke speaks of two sisters, Martha and Mary, receiving Christ in their home. Christ loves both of them; both are dear to Him (cf. John, chs. 11-12). But even between them division arises, and Jesus has to intervene to reconcile them.
Only Christ gives unity to people. This is also the mystery about which the apostle Paul writes to the Colossians: every person reaches perfection in union with Jesus Christ, and through Him in such unity with all, where there is neither Greek nor Jew, where everything in heaven and on earth is united under Christ as head.