There are several books and teachers who either imply or explicitly state that intention is the key to magick. The entire basis of the Law of Attraction as popularized in The Secret is that intention is everything. This concept states that if you have an intention and focus on it strongly, you attract to you the heart of your intention. One of the most popular books in history virtually says this in its title: Think and Grow Rich. I have encountered this same, "intention is everything" attitude among Pagans and ceremonial magicians. I have attended many hundreds of rituals where we are instructed to "write our intention on a piece of paper" which is then burned or returned to us to be