If it is performed in a formal or customary and overly manner, you would be as good to omit it altogether; for the Lord takes our prayers not by number but by weight. When it is an outward picture, a dead carcass of prayer, when there is no life, no fervency in it, God does not regard it. Do not be deceived in this, it is a very common deception. It may be a man's conscience would be upon him, if he should omit it altogether. Therefore, when he does something, his heart is satisfied, and so he grows worse and worse. Therefore, consider that the very doing of the duty is not that which the Lord heeds, but He will have it so performed that the end may be obtained and that the thing for which you pray may be effected. If a man sends his servant to go to such a place, it is not his going to and fro that he regards, but he would have him to dispatch the business. So it is in all other works. He does not care about the formality of performance, but he would have the thing so done that it may be of use to him. If you send a servant to make a fire for you, and he goes and lays some green wood together and puts a few coals underneath, this is not to make a fire for you. He must either get dry wood, or he must blow until it burns and is fit for use. So when your hearts are unfit, when they are like green wood, when you come to warm them and to quicken them by prayer to God, it may be you post over this duty, and leave your hearts as cold and distempered as they were before. My beloved, this is not to perform this duty. The duty is effectually performed when your hearts are wrought upon by it, and when they are brought to a better tune and temper than they were before.