...there is really no limitation in the New Testament on the contents of petition. Any regulation is as to the spirit of the prayer, the faith it springs from. In all distress which mars your peace, petition must be the form your faith takes - petition for rescue. Keep close to the New Testament Christ, and then ask for anything you desire in that contact. Ask for everything you can ask in Christ’s name, i.e. everything desirable by a man who is in Christ’s kingdom of God, by a man who lives for it at heart, everything in tune with the purpose and work of the kingdom in Christ . If you are in that kingdom, then pray freely for whatever you need or wish to keep you active and effective for it, from daily bread upwards and outwards. In all things make your requests known. At least you have laid them on God’s heart; and faith means confidences between you and not only favours. And there is not confidence if you keep back what is hot or heavy on your heart. If prayer is not a play of the religious fantasy, or a routine task, it must be the application of faith to a concrete actual and urgent situation. Only remember that prayer does not work by magic, and that stormy desire is not fervent, effectual prayer. You may be but exploiting a mighty power; whereas you must be in real contact with the real God. It is the man that most really has God that most really seeks God.
From The Soul of Prayer, by P T Forsyth, chapter 5.