“You do not know what you are asking. Can you drink the cup that I am going to drink?”
They said to him, “We can.”
He replied,
“My cup you will indeed drink,
but to sit at my right and at my left,
this is not mine to give
but is for those for whom it has been prepared by my Father.”  (Mt 20:22-23)

When the Lord tells the two ambitious disciples, "My cup you will indeed drink," he was not referring to a gold cup on the altar.  As Saint John Chrysostom reminds the church, "God has no need of golden vessels but of golden hearts."