Truly I say to you, Among those born of women there has not arisen one greater than John the Baptist, yet he who is least in the kingdom of the heavens is greater than he.” ~Matthew 11:11
John the Baptist was greater than the prophets because he saw Christ. How can the least in the kingdom of the heavens be greater than John? Because the believers, those in the kingdom of the heavens, have the resurrected Christ within them. The closer one is to Christ, the greater one is.