Often times when people repeat things over and over again, they are doing it intentionally because they really want you to get the point, the message, the emphasis.
Notice what Jesus keeps repeating:
Matthew 18:4 “Whoever humbles himself like this child is the greatest in the kingdom of heaven.”
Matthew 20:26 “It shall not be so among you. But whoever would be great among you must be your servant,”
Matthew 23:12 “Whoever exalts himself will be humbled, and whoever humbles himself will be exalted.”
Luke 9:48 “For he who is least among you all is the one who is great.”
Luke 14:11 “For everyone who exalts himself will be humbled, and he who humbles himself will be exalted.”
Luke 18:14 “I tell you, this man went down to his house justified, rather than the other. For everyone who exalts himself will be humbled, but the one who humbles himself will be exalted.”
LETS BE CAREFUL TO NOT MISS THE POINT! JESUS MEANS WHAT HE SAYS. LORD, MAKE US SMALL!