Akshay Gaur : In order to achieve what you want, you have to feel that you have already achieved it and this feeling of yours works to turn your dream into reality, by releasing precise vibrations. And visualization and gratitude work to bring this feeling in you.
When you do visualization then you see the visuals after the dream is fulfilled and those visuals create the same feeling in you. And when you give thanks for the dream even before it is fulfilled, then by doing so you feel that your dream has already come true. Thats why visualization and gratitude has an important role in law of attraction.