Desires and manifesting are tricky, usually there reactions to a circumstance which in turn creates further reactions. Have you seen the movie the fifth element with Bruce Willis and Milla Jovovich. When this dark matter appeared, humans reacted to it and the more they reacted, the bigger the mass got, this was pure consciousness and this is how consciousness itself works.
When we see a threat to our serenity, what do we do? We react which causes the threat to expand even more, the trick is to not react, this is not easy to do.
We actually don't have to manifest or desire anything as it's already there, it's just we are unaware of this. Serenity has always been there, we are just unaware of this.
"Are reactions our teacher", a very good thought, yes but only if we are going to learn from them, otherwise they just become a continuous nightmare. An unenlightened consciousness can become entrapped within this nightmare but this can only happen if we are asleep, in other words not awakened (enlightened).
What if man met this dark mass with love in the movie the fifth element instead of aggression, you might like to think this dark mass would just go away but consciousness doesn't work like this, any kind of reaction/ recognition actually endorses such dark consciousness, this dark mass would continue to consume Earth.
A true enlightened state, an awakened consciousness, is another matter, this consciousness doesn't see a dark mass but only consciousness. This dark mass only becomes consciousness because there is no right or wrong, dark or light, only the ego sees it as this.
We humans only see serenity as opposed to chaos, an enlightened consciousness only sees a consciousness being expressed. Basically everything becomes light only because of the extent of our awareness in a true enlightened state from an unenlightened state. This is the same when we turn the light on in a dark room, we become aware of everything the light shines on, however, a true enlightened state actually negates light and dark, everything is known without a reaction, like turning on a light, mainly because nothing is being obscured from such awareness.