I suggest you read Neville's "Prayer The Art of Believing".

Law of Reversibility. If achieving your desire would bring about a feeling of joy and happiness/positivity etc, then inversely generating that feeling within will bring about the desired manifestation.

because you can't be emotional 24/7 do you

That's like saying you can't think a thought 24/7. You are always in a state of emotion. Do you know someone who has lost a loved one? Often that person will be in a state of depression for weeks. Just because you have become so used to an emotional state of apathy/boredom you feel that is neutral or normal state and "positive" "happy" "joyful" emotions are only temporary bursts. That goes against even what Neville teaches.

Maybe it's your personal experience that the joy and all will dissipate, but you are speaking from a certain "state".

Neville also teaches that God is pure love. Love, as in the emotion that is the highest emotion. God isn't sometimes sad, sometimes bored, sometimes annoyed and sometimes love. He is sheer love.