Who is the greatest? Mark chapter 9 verses 33-35 and chapter 10 verses 35-45

33 Then He came to Capernaum. And when He was in the house He asked them, “What was it you disputed among yourselves on the road?” 34 But they kept silent, for on the road they had disputed among themselves who would be the greatest. 35 And He sat down, called the twelve, and said to them, “If anyone desires to be first, he shall be last of all and servant of all.”

35 Then James and John, the sons of Zebedee, came to Him, saying, “Teacher, we want You to do for us whatever we ask.”36 And He said to them, “What do you want Me to do for you?”37 They said to Him, “Grant us that we may sit, one on Your right hand and the other on Your left, in Your glory.”

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38 
But Jesus said to them, “You do not know what you ask. Are you able to drink the cup that I drink, and be baptized with thebaptism that I am baptized with?”
39 They said to Him, “We are able.” So Jesus said to them, “You will indeed drink the cup that I drink, and with the baptism I am baptized with you will be baptized; 40 but to sit on My right hand and on My left is not Mine to give, but it is for those for whom it is prepared.”

41 And when the ten heard it, they began to be greatly displeased with James and John. 42 But Jesus called them to Himself and said to them, “You know that those who are considered rulers over the Gentiles lord it over them, and their great ones exercise authority over them. 43 Yet it shall not be so among you; but whoever desires to become great among you shall be your servant.44 And whoever of you desires to be first shall be slave of all. 45 For even the Son of Man did not come to be served, but to serve, and to give His life a ransom for many.”