By imagining and concentrating on what you are doing, you clear psychological obstacles out of the way. This makes whatever you are doing more effective. In the case of transmutation, it is even more pronounced, since the sexual energy and imagination are very closely connected.
“Nothing is easier than self-deceit. For what each man wishes, that he also believes.” —Demosthenes
"Do not worry; cultivate the habit of being happy." —Samael Aun Weor