Hi Fabio,
No need to elaborate on Craig's response but here is the opening paragraph to the link he provided;PRAYING BY GOD’S RULES[God’s Prayer Rules are Simple but Not Easy]
Few subjects in the Bible are more mysterious or less understood than the subject of prayer. Few indeed know how to pray or what to pray about. And what is the proof of that statement? The proof is that most prayers are never answered. Hundreds of millions of people a day pray in vain. They get no answer to their prayers. Why is this? Is there an answer as to why most prayers go unanswered? Absolutely, there is. Will most people accept the only and true Scriptural teaching on this subject? I’m afraid most will not.
There are many clich鳠regarding prayer, and some are absolutely true. It is said that God has one of three answers for all prayers: "Yes, No, or Later." This is basically, albeit not totally true. This one might be closer to the truth: "Your way, My way, or No way."
There is an interesting essay on prayer in which it is stated: "I got nothing that I asked for, but everything that I could have ever hoped for." That may make for a nice sentiment, but few would ever believe such a thing deep in their heart. Most people do not believe that they got everything in life that they could have ever hoped for.
Christians and heathens alike, ignorantly and stupidly believe that they can change the mind of a Sovereign God Who always knows long in advance how He will fulfill His perfect plan and purpose under every and all circumstances. Many imagine that answered prayer is when God changes His mind with regards to the way things were going in your life. In other words: You change your ways to please God, and God will change His mind and begin blessing you. NOT TRUE. God never, ever changes His mind about anything.
This subject of unanswered prayer is so incredibly simple that a child can understand it, yet many learned theologians and clergymen have not even a clue as to the ultimate Scriptural statement regarding prayer. I will first give you the number one pre-requisite to having prayers answered, and then I will give you a most amazing second witness from a Scripture that is preserved in very few Bible translations.
http://bible-truths.com/praying.htmHis Peace to you,
Joe