40 “Wherewith Your enemies have blasphemed You, O Lord”, both Jews and Pagans. “Wherewith they have blasphemed.” Wherewith have they blasphemed You? “With the change of Your Anointed.” They objected that Christ died, and was crucified. Madmen, what is your reproach? Although there is now no one to use it: yet supposing some still remaining that so speak, what is your reproach? That Christ died? He was not destroyed, but changed. He is styled “dead” on account of the three days. Wherewith then have your enemies blasphemed You? Not with the loss, not with the perdition of Your Anointed, but with His “change.” He was changed from temporal to eternal life: He was changed from the Jews to the Gentiles; He was changed from earth to heaven. Let then Your vain enemies blaspheme You still for the change of Your Anointed. Would that they may be changed: they will not in that case blaspheme the change of Christ, which displeases them since they themselves will not be changed. “For there is no change with them, and they fear not God.”
Source: The Enarrations, or Expositions, on the Psalms (New Advent)