This is a painting of James and John, the sons of Zebedee, who, in today's Gospel (Mark 10:35-45) come to Jesus and said to him, "Teacher, we want you to do for us whatever we ask of you."
That request seems outrageous, but Jesus only replied: "What do you wish me to do for you?"
I wonder how often Jesus asks us that same question.
Then, they ask that one of them may sit at his right and the other on his left when Jesus is glorified. They are not thinking of the other disciples, but want to be so honored. Jesus answers them with a question: "You do not know what you are asking. Can you drink the cup that I drink or be baptized with baptism with which I am baptized?
They answer in the affirmative: "We can."
When the other ten heard this, they became indignant at James and John. Then Jesus teaches them that "whoever wishes to be first among you will be the slave of all."