From: Luke 11:5-13
 And He (Jesus) said to them (the disciples), "Which of you who has a friend will go to him at midnight and say to him, 'Friend, lend me three loaves;  for a friend of mine has arrived on a journey, and I have nothing to set before him';  and he will answer from within, 'Do not bother me; the door is now shut, and my children are with me in bed; I cannot get up and give you anything'?  I tell you, though he will not get up and give him anything because he is his friend, yet because of his importunity he will rise and give him whatever he needs.  And I tell you, Ask, and it will be given to you; seek, and you will find; knock, and it will be opened to you.  For every one who asks receives, and he who seeks find, and to him who knocks it will be opened.  What father among you, if his son asks for a fish, will instead of a fish give him a serpent;  or if he asks for an egg, will give him a scorpion?  If you then, who are evil, know how to give good gifts to your children, how much more will the Heavenly Father give the Holy Spirit to those who ask Him!"
5-10. One of the essential features of prayer is trusting perseverance. By this simple example and others like it (cf. Luke 18:1-7) our Lord encourages us not to desist in asking God to hear us. "Persevere in prayer. Persevere even when your efforts seem barren. Prayer is always fruitful" ([St] J. Escriva, "The Way", 101).
9-10. Do you see the effectiveness of prayer when it is done properly? Are you not convinced like me that, if we do not obtain what we ask God for, it is because we are not praying with faith, with a heart pure enough, with enough confidence, or that we are not persevering in prayer the way we should? God has never refused nor will ever refuse anything to those who ask for His graces in the way they should. Prayer is the great recourse available to us to get out of sin, to persevere in grace, to move God's heart and to draw upon us all kinds of blessing from Heaven, whether for the soul or to meet our temporal needs" (St. John Mary Vianney, "Selected Sermons", Fifth Sunday after Easter).
11-13. Our Lord uses the example of human parenthood as a comparison to stress again the wonderful fact that God is our Father, for God's fatherhood is the source of parenthood in Heaven and on earth (cf. Ephesians 3:15). "The God of our faith is not a distant Being who contemplates indifferently the fate of men--their desires, their struggles, their sufferings. He is a Father who loves His children so much that He sends the Word, the Second Person of the Most Blessed Trinity, so that by taking on the nature of man He may die to redeem us. He is the loving Father who now leads us gently to Himself, through the action of the Holy Spirit who dwells in our hearts" ([St] J. Escriva, "Christ Is Passing By", p. 84).
13. The Holy Spirit is God's best gift to us, the great promise Christ gives His disciples (cf. John 5:26), the divine fire which descends on the Apostles at Pentecost, filling them with fortitude and freedom to proclaim Christ's message (Acts 2). "The profound reality which we see in the texts of Holy Scripture is not a remembrance from the past, from some golden age of the Church which has since been buried in history. Despite the weaknesses and the sins of every one of us, it is the reality of today's Church and the Church in all times. 'I will pray to the Father,' our Lord told His disciples, 'and He will give you another Counsellor to be with you for ever.' Jesus has kept His promise. He has risen from the dead and, in union with the eternal Father, He sends us the Holy Spirit to sanctify us and to give us life" ([St] J. Escriva, "Christ Is Passing By", 12).
Source: "The Navarre Bible: Text and Commentaries". Biblical text taken from the Revised Standard Version and New Vulgate. Commentaries made by members of the Faculty of Theology of the University of Navarre, Spain. Published by Four Courts Press, Kill Lane, Blackrock, Co. Dublin, Ireland. Reprinted with permission from Four Courts Press and Scepter Publishers, the U.S. publisher.