Now may our Lord Jesus Christ himself, and God our Father, who loved us and gave us eternal comfort and good hope through grace, comfort your hearts and establish them in every good work and word. 2 Thessalonians 2:16-17
Peter wrote to the believers in Asia Minor that they should “always be prepared to give an answer to any one who asks them to give a reason for the hope that is in them” (1 Peter 3:15). That implies two things.
One is that Christians ought to be known as hopeful people. If an unbeliever watches you for a while and then asks about something, at least part of what he asks about should be your hope. Our hope should show. It should show in joy (Romans 12:12) and love (Colossians 1:4–5) and boldness (2 Corinthians 3:12) and endurance (2 Thessalonians 1:3).
The other thing that Peter implies is that there are reasons for Christian hope. It is a reasonable hope. It may have looked irrational when Abraham felt strong confidence that he would be the father of many nations even though he was too old and his wife was barren. But it was not irrational! There was good reason to hope. And we should know why we hope. The answer is very simply, the grace of God.