The woman, was aware that Jesus was the King of kings and Lord of lords, and knew that He is given the best, our total dedication, our complete adoration. While the disciples thought of the cost of perfume and that for them It was a waste .... She knew what to say, what was the most important thing at that moment .... To be at the feet of Christ !!!
Here we can also read, the power of discernment that Jesus Christ showed ... by revealing what was going to happen, he knew that the time had come when Judas would deliver him ... he told Pedro that he would deny it before the rooster sang, and so it was ... because God is omniscient and will always demonstrate his power for ever and ever.