John Wesley on Exodus 34:33

And Moses put a veil upon his face - This veil signified the darkness of that dispensation; the ceremonial institutions had in them much of Christ and the gospel, but a veil was drawn over it, so that the children of Israel could not distinctly and steadfastly see those good things to come which the law had a shadow of. It was beauty veiled, gold in the mine, a pearl in the shell; but thanks be to God, by the gospel, the veil is taken away from off the old testament; yet still it remains upon the hearts of those who shut their eyes against the light.