The Foundation of Reality, the Truth of Truths, is that “reality is what it is believed to be”.
Belief is based on both the conscious and subconscious levels.
The Corollary of Alteration is the corollary principle to the Foundation of Reality, as applied to willfully altering reality. It states: “One can alter reality if they believe that they will succeed.” Basically, magical effects are based on a conscious desire and a subconscious trust - faith - in something, whether that is one’s own faith power, or the power of one’s deities, or the power of one’s artifacts, ingredients, rituals, or incantations. It is not sufficient to simply want to have such an effect happen; if their subconscious doesn’t believe that they will succeed, then they will fail, and nothing will happen.