There is bad news and good news in 2 Corinthians 4:16 - 5:5. The bad news: if we put our hope in this life, we are going to be disappointed because we are not going to live forever and our hope dies with us. The good news: Jesus has purchased for us an eternal hope by what he accomplished on the cross. Jesus also provides us a down-payment for the assurance of eternal hope by sealing us with the Holy Spirit.
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