Jesus was describing to the of Israel requirements for entering the offered earthly kingdom. Those of Israel would be provided for by God and supernaturally changed to keep the law.
Jer 31:31 Behold, the days come, saith the LORD, that I will make a new covenant with the house of Israel, and with the house of Judah:
Jer 31:32 Not according to the covenant that I made with their fathers in the day that I took them by the hand to bring them out of the land of Egypt; which my covenant they brake, although I was an husband unto them, saith the LORD:
Jer 31:33 But this shall be the covenant that I will make with the house of Israel; After those days, saith the LORD, I will put my law in their inward parts, and write it in their hearts; and will be their God, and they shall be my people.
Jer 31:34 And they shall teach no more every man his neighbour, and every man his brother, saying, Know the LORD: for they shall all know me, from the least of them unto the greatest of them, saith the LORD: for I will forgive their iniquity, and I will remember their sin no more.
Christians have a somewhat similar call
Gal 5:16 This I say then, Walk in the Spirit, and ye shall not fulfil the lust of the flesh.
In Galatians chapter five a description is given contrasting the flesh (selfishness) with walking by the Spirit (the selfless love of Christ). It is expected that Christians would participate in the transition.
2Co 5:15 And that he died for all, that they which live should not henceforth live unto themselves, but unto him which died for them, and rose again.
