God does not give heed to the ambitiousness of our prayers, because he is always ready to give to us his light, not a visible light but an intellectual and spiritual one; but we are not always ready to receive it when we turn aside and down to other things out of a desire for temporal things.
Now, justification in this life is given to us according to these three things: first by the laver of regeneration by which all sins are forgiven; then, by a struggle with the faults from whose guilt we have been absolved; the third, when our prayer is heard, in which we say: 'Forgive us our debts,' because however bravely we fight against our faults, we are men; but the grace of God so aids as we fight in this corruptible body that there is reason for His hearing us as we ask forgiveness.
Why pray? Evidently, God likes to be asked. God certainly does not need our wisdom or our knowledge, nor even the information contained in our prayers ("your Father knows what you need before you ask him"). But by inviting us into the partnership of creation, God also invites us into relationship. God is love, said the apostle John. God does not merely have love or feel love. God is love and cannot not love. As such, God yearns for relationship with the creatures made in his image.
Like all good things, prayer requires some discipline. Yet I believe that life with God should seem more like friendship than duty. Prayer includes moments of ecstasy and also dullness, mindless distraction and acute concentration, flashes of joy and bouts of irritation. In other words, prayer has features in common with all relationships that matter.