This refers back to what Paul said starting in [2 Corinthians 3:14](../03/14.md). There Paul explained that there is a spiritual veil that prevents people from understanding when they read the old covenant. In the same way, people are not able to understand the gospel. (See: [[rc://en/ta/man/jit/figs-metaphor]])
This can be stated in active form. Alternate translation: "if a veil covers our gospel, that veil covers it" (See: [[rc://en/ta/man/jit/figs-activepassive]])