The Japanese introduced a tree to the world that is called a Bonsai tree. It is measured in inches instead of feet as other trees are measured. It is not allowed to reach anywhere near its full growth potential but instead grows in a stunted miniature form.
The reason for it growing in stunted form is that when it first stuck its head out of the ground as a sapling, the owner pulled it out of the soil and tied off its main tap root and some of its branch feeder roots and then replanted it. By doing this, its grower deliberately stunted its growth by limiting the roots ability to spread out and grow deep and take in enough of the soils nutrients for a normal growth.
What was done to the Bonsai tree by its owner is what Satan has purposed to do to the believer, if he can. He is going to try to tie off our tap root of prayer. He wants to limit our receiving in prayer what God supplies for our spiritual growth.