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The Breviary contains  two  different  versions  of  this Psalm: first,  the  one  which  is  read  in  the  office  of  the Epiphany and  which  conforms  to  the  Vulgate  or  Gallican  can Psalter (second  revision  of  St.  Jerome);  the  second,  which is our  Invitatory,  represents  the  older  text  of  St.  Jerome's first  Version  made  by  order  of  Pope  Damasus. It had been used  as  a  respbnsory  to  invite  the  monks  from their cells  at  midnight  or  matin  hour  to  the  choir,  and had served  as  Invitatory  even  before  that  time  in  the synagogues for the  Sabbath  service. The old  form  of  this morning call  to  prayer  retained  its  hold  on  the  Roman  clergy despite subsequent  changes  and  corrections  of  the  remaining parts.

ome, let  us  sing  to  the Lord; let  us  rejoice in God,  our  Saviour. Let us enter  His  presence  with thanksgiving, and  with psalms proclaim  our  joy.

For great  is  Our  Lord, God; and  a  king  He thrones  above  all  who rule. For in  His  hand are all  parts  of  the  earth however remote,  and  He looks  down  upon  the  highest mountains.

For His  is  the  sea, since He  created  it,  and He fashioned  the  earth with His  hands. Come, let us  prostrate  ourselves before God,  and  adore Him. Let us  implore the Lord  Who  created  us, for He  is  the  Lord  our God, and  we  are  His people and  the  flock  of His  pasture.

O, that  you  would  listen to His  voice  to-day! Do not harden  your  hearts