Dr. Hawkins says, "hold in mind what you desire, but without adding any desire to it." Because desire is what blocks us from getting it in the first place. Desire is the energy of inherent lack, because to desire something you must not have it to begin with right? that's putting lack out to the universe.
Also, the more you transcend ego and let it go, the less contradicting intents you have in your system, and the easier/faster it takes to manifest something. You are so in tune with Reality that whatever you think or say can manifest something, even if you didn't want it. I've heard of enlightened beings who are dismayed that they manifested something they didn't even want. Be careful what you wish for
Also...Jesus said, "seek first the kingdom of heaven, and all else shall be added unto you"... meaning, transcend ego first, then you can manifest what you want. Actually, you stop wanting to manifest anything, and you trust the Universe to give you what you really need. A good lesson to keep in mind