Assuming ‘true knowledge we have’ is referring to our brain’s preferential encoding of information given the intrinsic qualia of our experience, and that the perceived information is at least a fair representation of what is true, it would seem some kind of conscious knowledge is obtained. If we are limiting our definition of knowledge to that information which is seated in our brain, it does at first seem like this is the only true knowledge we can have. However, knowledge can come in more than one form, and importantly instinctual and reflexive behaviors seem to point to some innate kinds of knowledge that we may not become fully conscious of until later. In a similar thread shared knowledge that is verifiably true seems to validate that true knowledge can exist separate from whether we experience it or not. However, if this knowledge is based on illusions and all our systems for verifying truth are actually just part of this great illusion, then it would seem that it may not matter whether it’s all an illusion because it still is in effect the ‘reality’ we have to work with.