In the Sacrament of Holy Orders, or Ordination, the priest being ordained vows to lead other Catholics by bringing them the sacraments (especially the Eucharist), by proclaiming the Gospel, and by providing other means to holiness.
Martha, Mary and their brother Lazarus were evidently close friends of Jesus. He came to their home simply as a welcomed guest, rather than as one celebrating the conversion of a sinner like Zacchaeus or one unceremoniously received by a suspicious Pharisee. The sisters feel free to call on Jesus...