Can I undo Salvation that God has given?
Consider the “golden chain” of salvation in Romans 8:29-30. Paul expresses the five links of the chain this way: foreknown, predestined, called, justified, glorified. The first two refer to God’s decision to save those who trust in Christ; the second two terms refer to God’s activity in actually saving those whom he has chosen. But the last phrase—"glorified"—refers to what happens when God’s children finally get to heaven.
However; Paul expresses this truth about our future glorification in the past tense… how does that work? It’s already done, accomplished fact, “finito”, done deal, you are already but not yet glorified. God lives outside of space and time, the past, the present and future are all the same to Him. In God’s point of view, we are already in heaven, having been glorified! If God has already done something I couldn’t do, what can I do to undo it?