The power of self delusion can be significant. Its just extremely difficult to effectively harness it as a practical tool to enhance your ability to interface with the world around you while at the same time preventing yourself from being consumed by it and understanding any wide reaching consequences it might have.
Your perception of an event is what gives meaning to it therefore you ultimately have full control of its effects on you. The problem is the logical part of the mind can't be lied to by itself and its influence over the intuitive/emotional part is great.
There seems to be ways to bypass the logical centers and strike directly at the intuition though. If you take clinical hypnosis for example: actively resist its effects with your rational thought and it makes it impossible to be put under. An interesting experiment is to try to get yourself drunk off regular tea. If you do it at night when you're already kind of groggy and your ability to think rationally is blunted. Create a source of fire (it has a hypnotizing effect) and use unusual containers for the tea to attach a delusional notion of importance to them. Add drama to your actions and act like an occultist or fanatic. You're forcing a placebo effect.
You can enhance your perception of events in the same way people lie when recounting past stories just to make them more interesting. This type of lie is completely justified because the function of the story is to entertain the audience. Recently i visited this place at 3am during a rainstorm:
The buildings rise in three stages up the side of a cliff on the right bank of the river, which here runs between rocky walls 400 ft. in height. Flights of steps ascend from the lower town (tier1) to the churches (t2), a group of massive buildings half-way up the cliff. The chief of them is the pilgrimage church of Notre Dame, containing a cult image at the center of the site's draw.
Here the darkness is a catalyst. The fear of possible or imagined dangers concealed by the darkness always exist in the primitive mind. The rational mind steps in and provides context to reassure that any fear is unfounded in this scenario. But that is kind of boring so instead i provoked the fear by letting my imagination run away with it. The darkness now contains demons and that huge fucking stray dog i saw 15 minutes ago was a werewolf and now there might be more in the cave up ahead. The rain, darkness and severe gothic architecture are now in conspiracy to oppress me. The corpses in the crypt of the church below my feet are probably wandering the halls. So the brain takes all this in and decides to dump a delicious cocktail of chemicals into the blood enhancing the situation even further. So eventually i manage to get to the top of the cliff in the complete dark without tripping over my own shoelaces and end up being completely butthurt that there was no vampire waiting for me to drive a stake through.
Another amusing trick is to give yourself motion sickness through a perception shift. Stare at the ground and imagine that your skull is the center of the universe and is stationary and unable to move. Imagine any movement as being the result of the universe spinning around your stationary skull. Now rotate your head back and forth. Puke.
So how does any of this stupid delusional shit relate to your ability to interface with reality? By juggling contexts and shifting perception you can effectively manipulate your primal reactions to stimuli - it doesn't even matter if the context is bullshit as long as it has a functional use. If we were to connect this with that other thread about the cave dwelling aspergers case you could provide some useful tricks in dealing with women. Lets say you just bumped into your concept of the ideal woman. If your natural reaction is to perceive her as a goddess you've just shot yourself in the foot - the only thing a mortal can do to a god is grovel and worship. Now if you decide to view her as rape bait you've just made things way easier on yourself.
Delusional thinking may be a crutch but a crutch is a very useful tool for the gimp.