Prayer is never an acceptable substitute for obedience. The sovereign Lord accepts no offering from His creatures that is not accompanied by obedience. To pray for revival while ignoring or actually flouting the plain precept laid down in the Scriptures is to waste a lot of words and get nothing for our trouble.
All systems of morality are fine. The gospel alone has exhibited a complete assemblage of the principles of morality, divested of all absurdity. It is not composed, like your creed, of a few common-place sentences put into bad verse. Do you wish to see that which is really sublime? Repeat the Lord's Prayer.
We offer up prayers to god only because we have made him after our own image. We treat him like a pasha, or a sultan, who is capable of being exasperated and appeased.
God's signs are not always the ones we look for. We learn in tragedy that his purposes are not always our own. Yet the prayers of private suffering, whether in our homes or in this great cathedral, are known and heard, and understood.
The Prophet introduced a system of prayer in that it was interwoven into man's daily work: a prayer in the morning when he arose from his bed; a prayer at lunch time, as an indication that if his body needed a diet, so did his spirit; a prayer in the afternoon when he retired from his daily work; a prayer at sunset and a prayer when going to bed.
I do know this: God does answer your prayers, but it's not always in the way you expect. God knows what's best for us, though, so there's no need to worry when things don't go how we originally wanted them to go.
The greatest proof of Christianity for others is not how far a man can logically analyze his reasons for believing, but how far in practice he will stake his life on his belief.