Read these two chapters hypothesizing there are two types of prayers. The first, Cat Prayers, are selfish and ask for the Lord to help them increase their own kingdom. The second, Dog Prayers, are spoken out of loyalty and love for the Lord to help them build His Kingdom.
You may want to discover more about fasting for your prayer life. Read these two chapters from The Fasting Journey. They address "the purpose of fasting" and "the Biblical background of fasting."