From that time Jesus began to preach, and to say,
Repent: for the kingdom of heaven is at hand.
All Commentaries on Matthew 4:17 Go To Matthew 4
Theophylact of Ochrid
AD 1107
From the time John was arrested, Jesus began to preach. For Jesus waited for John to first bear witness to Him and to prepare the way for Him, in the same manner in which servants make preparations for their masters. Being equal to the Father, the Lord also had John as a prophet, just as God the Father had the prophets who were before John; yet in truth these were the prophets of both the Father and the Son.
The kingdom of heaven is Christ and it is also the life of virtue. For when someone lives as an angel on earth, is he not heavenly? So the kingdom of heaven is within each one of us when we live as angels.