The lovely words of the Irish hymn-writer, George Croly
serve as a simple reminder of why we desperately need the Holy Spirit
poured out upon us:

Spirit of God, descend upon my heart,
wean it from earth, through all its pulses move;
Stoop to my weakness, mighty as Thou art,
and make me love Thee as I ought to love.

• According to Romans 8, when the Spirit descends upon our hearts,
  He rivets our attention upon the Lord Jesus Christ and His work
  for us on the cross.
• When the Spirit descends upon our hearts, He produces in us the
  family trait of holiness by granting us the desire, determination and
  discipline to reject and kill sin.
• When the Spirit descends upon our hearts, He assures us of our sonship
  and of our permanent gift of eternal life.

Martin Luther explains:
The Law scolds us, sin screams at us,
death thunders at us, the devil roars at us.
In the midst of the clamor,
the Spirit of Christ cries in our hearts: ‘Abba, Father.’
This little cry of the Spirit transcends
the hullabaloo of the law, sin, death, and the devil
and finds a hearing with God.

• Luther’s Commentary on the Epistle to the Galatians

No wonder we call the Holy Spirit the “Lord and Giver of Life!”