A.T. Robertson Commentary 2 Corinthians 13:4

"for he was crucified through weakness, yet he liveth through the power of God. For we also are weak in him, but we shall live with him through the power of God toward you." — 2 Corinthians 13:4 (ASV)

But we shall live with him through the power of God (αλλα ζησομεν συν αυτω εκ δυναμεως θεου). So real is Paul's sense of his union with Christ.