Luke 11:27-28 27 And it came to pass, as he spake these things, a certain woman of the company lifted up her voice, and said unto him, Blessed is the womb that bare thee, and the paps which thou hast sucked. 28 But he said, Nay rather, (Greek Menounge: nay surely, nay rather) blessed are they that hear the word of God, and keep it.
Mary heard the word of God, and kept it.
"And the angel being come in, said unto her: Hail, full of grace, the Lord is with thee: blessed art thou among women. [...] Elizabeth was filled with the Holy Ghost: And she cried out with a loud voice, and said: Blessed art thou among women, and blessed is the fruit of thy womb." - Luke 1:28,41-42