John Piper, The Roots of Endurance:
The twenty-first century will not be an easy time to be a Christian. It is not meant to be easy. But we are not left without help. The Bible centers on a crucified, risen, and reigning Christ and is full of promises for every crisis. And the history of God’s church is full of empowering examples of those who proved that the grace of God is sufficient to enable us to endure to the end and be saved.
Words of Grace 