6 “And Your mercy shall follow me all the days of my life:” that is, as long as I live in this mortal life, not Yours, but mine. “That I may dwell in the house of the Lord for length of days”. Now Your mercy shall follow me not here only, but also that I may dwell in the house of the Lord for ever.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)