With each thought that matches your desire, the average vibration of your thought is skewed in the direction of the desire's frequency. Therefore, as the number of thoughts matching your desire increases, so increases the momentum of your movement toward its manifestation for as long as the desire has yet to manifest.
Likewise, the more intense is the degree of positivity experienced while thinking of your desire, the greater is the difference between that thought and your previously maintained vibration, the greater is the impact that thought has on your vibration, and the more your vibration is changed as a result thereby adding momentum to the rate at which your reality is becoming a match to the vibration of your desire.