“And from the days of John the Baptist until now the kingdom of heaven suffereth violence, and the violent take it by force.”
King James Version (KJV)
11:12 And from the days of John - That is, from the time that John had fulfilled his ministry, men rush into my kingdom with a violence like that of those who are taking a city by storm.
Mt 11:12 From the days of John the Baptist until now, etc. The idea is, that from the time when John began preaching, men of violence were trying to force their way into the kingdom. It is compared to a walled city that men try to storm and enter. They tried a little later to make Jesus a king by force.