8 “Speedily hear me, Lord”. For what need of delay to inflame my thirst, when already I thirst so eagerly? You delayed the rain, that I might drink and imbibe, not reject, Your inflowing. If then Thou for this cause delayed, now give; for “my spirit has failed.” Let Your Spirit fill me. This is the reason why You should speedily hear me. I am now become “poor in spirit,” make Thou me “blessed in the kingdom of heaven.” For he in whom his own spirit lives, is proud, is puffed up with his own spirit against God....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)