How do we know universalism is false?

Paul's writings explicitly state that reconciliation is not universal in the sense of absolution for all humanity. In 2 Corinthians 5:19, the context reveals that while God was reconciling the world unto Himself, it does not mean every individual is automatically saved. The term 'world' holds different meanings throughout Scripture, which can refer to humanity, creation, or systems contrary to God's will. This understanding makes it clear that a universal application of reconciliation overlooks the specificity of God's election and predestination, both integral to Reformed theology.