You will reap what you sow upon the earth.
He that is not with me is against me; and he that gathereth not with me scattereth abroad. (Matthew 12:30 KJV)
This scripture verse is short and precise in its inspired message. God does not have a proverbial fence upon this earth that we can relax and rest upon, or go back and forth between choosing His way and the way of the god of this world. God freely offers all mankind the opportunity to make just one choice complete with eternal consequences; either to gather together with Him becoming a part of His spiritual family while living upon this earth or scattering abroad the things of the god of this world.
Man makes this choice according to how he chooses to live upon this earth. This choice is brought to fruition immediately upon physical death. The eternal realm is where mankind is either rewarded according to following the pathway towards the things of God; or punished forever for following after the things of the god of this world which are in enmity towards the things of God.
There are only two pathways in this world; like a line drawn in the sand; a person is living clearly on one side or the other. Both paths lead to an eternal existence but at opposite ends of the eternal realm. All will go to an eternal realm upon their physical death in this world. One path upon this earth leads to an eternity spent with God and His Son in the heavenly realm. The other choice leads mankind to spend all eternity in the burning fires of Hell for all eternity.