Who said, "Never waste a good crisis."? Not Winston Churchill, though he often gets credit. In 1976, a doctor used the phrase in an article. In the first century, the apostle Paul was already putting the principle into practice.
When Demetrius accused the Christians of ruining his idol business, the Ephesian crowd seized two of Paul's companions. Did Paul run for his life to get away? No. He thought this might be a great opportunity to preach the gospel to a large crowd.
Life throws us plenty of curves. When we face adversity, instead of lamenting our pain, we might ask, "How can God use me in this moment to advance the Kingdom?" I hope we don't face a crisis today, but if we do, let us not waste it. Eternity is at stake.