Sye challenges Winger with the concept of epistemic certainty vs. psychological certainty; presses him on whether God's existence can fail to be true

Sye draws a distinction: psychological certainty is being convinced of something that could be false; epistemic certainty is when a proposition cannot fail to be true. He presses Winger to confirm that the existence of God is epistemically certain. Winger says he is certain God exists but admits he does not fully grasp the distinction. Sye argues that certainty must be grounded in God — autonomous reason cannot produce epistemic certainty.