To me, the phrase "free your mind" means to allow your brain to think outside of the limits that you place upon it. A similar phrase would be "think outside the box." I take it as an attempt to allow for creativity, partially by ignoring the physical limits which we must consider every day. For instance, the Wright Brothers were able to build an aircraft even though no known human had flown before; they removed this as a constraint of their belief system. They had to believe that humans could fly and that they only had to find the means. Maybe a weak example, but I hope it gets my point across.
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