For though he was crucified through weakness, yet he lives by the power of God. For we also are weak in him, but we shall live with him by the power of God toward you.
All Commentaries on 2 Corinthians 13:4 Go To 2 Corinthians 13
Paul is referring here to the personal experience of the apostles, who were made weak by being treated badly, imprisoned and beaten… Believers are made strong by being weak. Death inflicted by unbelievers is life as far as believers are concerned, for they will rise again to reign with Christ. Commentary on Paul’s Epistles.