4 “You have moved the earth, and hast troubled it”. How has the earth been troubled? In the conscience of sinners. Whither go we? Whither flee we, when this sword has been brandished, “Repent, for near has drawn the kingdom of Heaven”? “Heal the crushings thereof, for moved it has been.” Unworthy it is to be healed, if moved it has not been: but you speak, preachest, threatenest us with God, of coming judgment holdest not your peace, of the commandment of God you warn, from these things you abstain not; and he that hears, if he fears not, if he is not moved, is not worthy to be healed. Another hears, is moved, is stung, smites the breast, sheds tears....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)