So what is the key? How does a "Martha" learn to be a "Mary"?
Isaiah 45:22 says, "Look unto me, and be ye saved, all the ends of the earth: for I am God, and there is none else." For Martha's testimony, please read John 11:25-27. It all starts with salvation. A "Martha" can never be a "Mary" without salvation.
Ecclesiastes 12:1 says, "Remember now thy Creator in the days of thy youth, while the evil days come not, nor the years draw nigh, when thou shalt say, I have no pleasure in them." Martha had to be reminded about "that good part." (Luke 10:42) She had to be reminded of God's promises.
Martha submitted to the Lord's correction. Luke 10:41-42
Martha submitted to the Lord's salvation. John 11:25-27
Martha submitted to the Lord's reminder of His Words. John 11:40
With these three things, Martha learned to be a Silent Servant - busy serving, yes, but even busier being silent and listening to every word her Master had to say. She went from calling Him "Lord" to calling Him "Master."
Salvation happens one time, but every day we must remember God's promises. Every day, we must submit and listen carefully to what He has to say. I want to be like the Martha we see in John 12:1-2. Martha the Brave, Martha the Organizer, Martha the Submitted Servant - always listening to hear what the Master has to say.