Matthew 21:43 seems to contradict John 6:37

Matthew 21:43 says > *....the kingdom of God will be taken away from you.* In order for the kingdom to be taken, it had to have been given. So, the people that Jesus is talking to would have been part of the kingdom. John 6:37 says > *....the one who comes to me I will never cast out.* Cast out of where? Context seems to be talking about eternal life (see vs 27 and 40). Assuming that the “kingdom of God” and “eternal life” are in essence the same, then these verses seem to contradict each other. Or does my understanding of these verses need to be corrected?