Mark 14:3
While he was in Bethany, reclining at the table in the home of Simon the Leper, a woman came with an alabaster jar of very expensive perfume, made of pure nard. She broke the jar and poured the perfume on his head.

⁴ Some of those present were saying indignantly to one another, “Why this waste of perfume? ⁵ It could have been sold for more than a year’s wages and the money given to the poor.” And they rebuked her harshly.

i remember a speaker once said, those pple said it was a waste, it shows they don't think Jesus is worth it. and sometimes we do things, pple may say, why u do this, why u do that, why u spend time and money. 

But Jesus is worth it. He is worth more than what we can ever give to Him. And it is an expression of worship, when we can give our best parts to Him. We are unworthy. He is worthy of more than we can give. But He doesn't look down on us. The same way a father would not look down on a biscuit his son saves for him from school, in fact he cherishes it.

And it is the best thing in the world, to be able to give your best parts to Jesus.

Like A said, God is a mystery.