Test analysis: "Beauty is the perceptual expression of ideas", and "ideas" refer to absolute ideas and absolute spirits. He believes that beauty is the external expression of absolute spirit and belongs to objective idealism. "Great thinkers will go astray in greatness" implies negation of negation. The first stage of negation is a lost way, but it will eventually return to affirmation, which is the inevitability of thinking, and A does not conform to it. "World history is nothing more than the progress of free consciousness", and B thinks that the objective world is a reflection of subjective consciousness and an idealistic view, which is correct. "Absolute light is like absolute darkness", which embodies the unity of opposites between light and darkness and embodies dialectical thinking, and C does not conform. "Everything that exists is natural and reasonable" embodies dialectical thinking, and D does not conform. The answer to this question is B.