Of course this rule of inversion is too simple to hold good in all cases. Yet it is one of the most general rules for dreams, and applies most often to desire-and-fear dreams of a psychic nature.

So that an incest-dream would not prove an incest-desire in the living psyche. Rather the contrary, a living fear of the automatic conclusion: the soul’s just dread of automatism. And though this may sound like casuistry, I believe it does explain a good deal of the dream-trick. — That which is lovely to the automatic process is hateful to the spontaneous soul. The wakeful living soul fears automatism as it fears death: death being automatic.

It seems to me these are the first two dream-principles, and the two most important: the principle of automatism and the principle of inversion.