The concept of purifying reality is mindless. What human minds do is acquire knowledge through applications of reason. Knowledge increases incrementally by building one element upon another. Correct reality gradually replaces incorrect reality. Thereby, knowledge evolves, as all realities evolve.
Truth evolves, technology evolves, biology evolves, social institutions and standards evolve.
If purified reality could be conceptualized at all, it would be a hypothetical end point, not anything in past tense. Pretending that there is a purified reality someplace defies the process of how reality is handled. One could say that Christ produced perfect truth. That concept creates an acceptable figure of speech, because the source material is extremely useful and reliable. He taught the most rock solid basics of the subject, using examples and parables to clarify unlike anything else in existence.