Lesson today.

When Jesus said, "All things whatsoever ye pray and ask for, believe that ye receive them and ye shall have them," he was uttering one of those many deep truths that were so clear to Him and that we are just beginning to see. He knew that everything is made out of mind and that without that positive acceptance on the part of the individual there is no mold into which mind can pour itself forth into form. In the mind of God there is the correct mold, the true knowing, but in the mind of man there is not always this true knowing. Since God can do for us only by doing through us, nothing can be done for us unless we are positively receptive, but when we realize the law and how it works, then we will provide that complete inner acceptance. By so doing we permit the Spirit to do the work, to make the gift.

The reason we can make our requests known with thanksgiving is because we know from the beginning that we are to receive and therefore we cannot help being thankful. This grateful attitude to the Spirit puts us in very close touch with power and adds much to the reality of the thing that we are dealing with. Without it we can do but little. So let us cultivate all the gratitude that we can. In gratitude we will send our thoughts out into the world, and as it comes back it will come laden with the fruits of the Spirit.

http://www.sacred-texts.com/nth/cms/cms13.htm