From Yahoo Answers:
Before I answer the question directly, I have to comment that some of the same basic spiritual issues that we face today have been faced by seekers many thousands of years ago. So, in a way, our sense that we are at the crest of modernism and breaking new ground for the continuing enlightenment is only partially true. In many ways we may also be so advanced in some areas (such as our scientific and technical understanding of the world around us), that we have become morons on the spiritual plane. A good example of this is that western thinking barely acknowledges the reality of reincarnation. And all of those spiritual influences from the past (and perhaps the future) are at the core of who we are. This mindset (not shared by billons of non-Christian people around the world) thus shuts a major portal to self-knowledge.
So there were cultures and subcultures and people throughout history who really understood some fundamentals much better than we do even in our post-modern existence (and granted they may also have been clueless in other areas). And I have my own personal spin on the Percival legend that I haven't heard from other sources.