2 Corinthians 3:14-15

Paul said inability to perceive God’s revealed glory persists to the present day among the Jews (cf. Romans 11:7).

"The Israelites’ inability to see the glory shining from Moses’ face, fading though that glory was, is treated as a parable of their descendants’ present inability to realize the transitory character of the Mosaic order and to recognize the unfading glory of the gospel dispensation." [Note: Bruce, p. 192.]

"This is always the result of refusing and suppressing the revelation of divine truth. A veil of intellectual darkness hides the glory which has been deliberately rejected." [Note: Hughes, p. 111.]

The "Old Covenant" (2 Corinthians 3:14) probably refers to the Mosaic Law, and "Moses" (2 Corinthians 3:15) probably refers to the whole legal system that Moses gave. This use of "Moses" is a common figure of speech called metonymy in which the name of one thing is used for that of another associated with or suggested by it, as in "the White House has decided" instead of "the President has decided."