Jesus told a parable of the unjust judge who finally gave a widow her due because of her persistence. God will also grant what we ask for, but seeks to have an ongoing conversation with us as we would with a friend. Also, as with friends, we cannot make demands of God but must trust that God loves us and will do what is right for us.
Based on Luke 18:1-8
Jesus told his disciples a parable about their need to pray always and not to lose heart. He said, ‘In a certain city there was a judge who neither feared God nor had respect for people. In that city there was a widow who kept coming to him and saying, “Grant me justice against my opponent.” For a while he refused; but later he said to himself, “Though I have no fear of God and no respect for anyone, yet because this widow keeps bothering me, I will grant her justice, so that she may not wear me out by continually coming.” ’ And the Lord said, ‘Listen to what the unjust judge says. And will not God grant justice to his chosen ones who cry to him day and night? Will he delay long in helping them? I tell you, he will quickly grant justice to them. And yet, when the Son of Man comes, will he find faith on earth?’
(New Revised Standard Version Bible: Anglicized Edition, copyright © 1989, 1995 National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved worldwide. http://nrsvbibles.org)