Exactly.
If you don't already know the truth, how would you recognize it?
It's pretty obvious that everything in the external world is an illusion or figment of our imagination but is there anything underlying it that's "real"? Same goes for the internal world of dreams and visions, there's really no difference save for the direction of projection. So what is real?
I believe it's to be found in the borderland between our inner and outer worlds. We pass through it briefly when waking and falling asleep. People who discover and invent things almost always get their intuitive knowledge in a flash while in this borderland and it is a favorite playground for autistic savants like me.
Einstein used to try to enter and maintain this state by holding a large ball bearing in his fingers over his bare toes. When he started to fall asleep his fingers would lose their grip and the ball bearing would crash onto his toes. While it did train him to maintain that state between awake and asleep, he also said that it messed up his sleep patterns for years afterward.
The real world is not our waking world, not our dream world, but whatever is in between projecting both those illusions.
Is that "truth"?
I'm not really sure, but that is where I'm looking for it.
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Circumstance Rules!