How do we know God will justify the saved?

The assurance of justification is grounded in the unbreakable chain of salvation outlined in Romans 8:30: 'Moreover whom he did predestinate, them he also called: and whom he called, them he also justified: and whom he justified, them he also glorified.' This chain reveals that God's plan is infallible; those He has purposefully elected will inevitably be justified. The basis of our justification is not our own deeds but Christ's redemptive work on the cross. If God has called and justified us, we can rest assured that we are secure in our salvation.