I asked the students if they could remember a time or experience they had that was so awesome they wish it would never have ended and that everyone could have experienced it.
I then asked them if they could remember a time or experience they had that was so awful, painful and miserable they wish it would have been over quickly, had never happened, and that they want no one to ever experience it.
God has created us all to live eternally. More importantly, God created us to live eternally with Him. That time or experience the students had that was so awesome is a small taste of what living eternally with God in heaven is like.
Although God created us to live eternally with Him, not everyone will. There will be people who will live eternally separated from God in hell. Jesus describes this as a place of weeping and gnashing of teeth (Luke 13:22-30). This place was not intended for us but for Satan and his demons because he wanted to be God and rebelled against Him (Isaiah 14:12-17). That time or experience that was awful, painful and miserable is just a tiny bit of what living eternally without God in hell is like.
We read several verses in the Bible that describe eternal life. By faith you can believe in Jesus and receive Him, having your sin debt paid by His death on the cross and spend eternal life with Him. Or, you can choose not to believe and receive Jesus and you will spend eternity separated from God paying the price for your sin. The choice is yours!