Why did Jesus say that if one wants to become first then one shall become last?

[Shri Anil asked: Pādanamaskāram Swami, few questions based on Bible is given below. Kindly grace replies to the same. At Your Divine Lotus Feet-anil

There is an incident in Bible in which close disciples of Jesus, Jacob and John approached Jesus and requested Him to give the boon such that they will be sitting on either side of Jesus in His abode in the upper-world. To which Jesus replied that what they are asking, they do not know and He told that that place is reserved for those chosen deserving devotees who alone will sit there. Then Jesus told to them that if one wants to become first then one shall become last. Why Jesus did told one wants to become first then one shall become last?]

Swami replied:- God decides the fruit based on the quality of devotion of any devotee and the devotee shall not ask for the fruit. If the devotee asks a specific fruit, it means that the devotee is omniscient to decide the level of the fruit. The devotee is not at all omniscient having very little knowledge and hence, the devotee shall not aspire for any fruit because the soul can’t decide whether it deserves the fruit at all. The devotee may not deserve any fruit and in such case, how any devotee can decide the level of fruit? The devotee does not know even whether he can enter the abode of God or not and the devotee is aspiring for the next seat to the seat of God! Hence, the devotee shall not aspire any fruit in return from God. This is the essence of the statement of Jesus.