Christians must have a proper understanding of the Kingdom of Heaven.  When Jesus spoke of the Kingdom of Heaven, He meant a particular level of  human consciousness.  He was not speaking of or referring to a place which Christians are destined to after death.  Many Christians make the mistake by failing to understand the phrases "Kingdom of Heaven" and "Kingdom of God."  This mistake, once made, can throw your spirituality off track for the rest of your lives if the proper understanding is not grasped.