He was praying in a certain place, and when he had finished, one of his disciples said to him, "Lord, teach us to pray just as John taught his disciples."…
I tell you, if he does not get up to give him the loaves because of their friendship, he will get up to give him whatever he needs because of his persistence. "And I tell you, ask and you will receive; seek and you will find; knock and the door will be opened to you. For everyone who asks, receives; and the one who seeks, finds; and to the one who knocks, the door will be opened. (Lk 11:1-13)
The disciples see Jesus praying. They have seen him praying and he has been praying many times. They have seen him getting up in the morning to go for his prayer and they have also seen him praying late into night. He has been praying before doing anything special or important. So they come to know that prayer is one of the major activities of Jesus and they asked him to teach them.
The prayer ‘Our Father’ is a model prayer. It has the basic elements of any prayer. Prayer is to praise God, to thank God, to welcome his kingdom and also to express our needs and desires. The persistence with which one prays shows the trust and the faith one has in praying. Prayer itself is a mystery which reveals the relationship that exists between the one who prays and God. Prayer cannot be measured by our human calculations. But it should reveal our faith and trust.
We believe that we receive whatever we pray for. Sure we will not receive negative thing and if we pray for negative things then it is not prayer. Prayer will always produce good effects. Because God is good and only good things will come out of God. Whatever comes out of God will in fact be good for us, even if, it may look negative in human calculations. Evil cannot come out of God.