Arghh! Interesting a spell that endures...
I think from the day we are born we use our senses (look, taste, touch..etc) to work out what to do. You can communicate a little with your parents (but not using spoken or written language) and as such they are unable to instruct you at such a young age...your intelligence and knowledge of truth grows from interaction and using you sensors only.
As we get older, like other creatures on this planet... our parents attempt to teach us more about the world, to gain a deeper appreciation, to fend for yourself. In nature animals and young humans learn through trial and error and careful oversight and suggestion from our parents (our parents are part of nature and a system we have learned to trust - we trust them).
As we age further and require more guidance, we stop behaving like other animals on this planet, instead we are influenced more by a complex system that cannot be tested with all your senses anymore. (communication and knowledge sharing increases through use of langauge), thus the more influenced we are, the less we rely on our own senses to work stuff out for ourselves and as such more and more our value system is grown by what others have taught us to believe.
Not saying this is good or bad, just suggesting the further we move away from natural systems and are taught things (with language), the less we use our sensors to confirm them, the more we just assume and trust the system. Based on this, just by virtue of possessing and using language it is possible, parts of our own deepest internal value system/judgement system that drives us maybe wrong/based on systems that aren't true, or worse the possibility exists they were put in place by others who haven't been completely honest with you and interfered with your learning for specific purpose :(