Why, she could use that same perfume to lavish it on Jesus, as a token of her thanks and love. Mary had an intense devotion to Jesus. He was the most important person in the entire world. Mary was praising Jesus, honoring Jesus, in effect, worshipping Jesus, sacrificing to Jesus. Many people today are concerned with right beliefs.
Right beliefs are good.
We need them. Many people today are concerned with right behavior. Right behavior is good. Mary shows us right emotion, right feeling. The heart we need for God is an intensely personal devotion, a powerful dedication of ourselves to his service.