Not everything is black and white, but in relation to God, it is. Good is relative from a human perspective. God created us to be in a relationship with Him. God is truly good, holy, and perfect. God cannot be in a relationship with a person tainted by sin, because sin is a lack of goodness. Jesus Christ forgives our sin when we choose to put our trust in Him, and we are "born again" in God's Holy Spirit, no longer covered with that taint of sin. God can then be in relationship with us again. If we do not choose that, then we cannot be with God. That's what Hell is, an eternal separation from God. Most people don't even realize or take for granted all the things we have on this Earth, all of which is provided for by God whether you believe in Him or not. That luxury doesn't exist in Hell because God is not there.
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