How do we know the doctrine of triumph in Christ is true?

The doctrine of triumph in Christ is rooted in God's eternal purpose which was established before the foundation of the world. Paul asserts in 2 Corinthians 2:14 that God causes His ministers to triumph in Christ, even amidst persecution and suffering. Though the apostles faced severe trials and death, their victory lies in being part of God's salvific plan through Christ. This triumph is not about worldly success, but rather about fulfilling God's redemptive purpose in bringing His elect into salvation through Christ's atoning work.