Change is the nature of all things, and "truth" or "knowledge" itself is not exempt from this law.  Yet we have been indoctrinated to seek a certain form of infallible knowledge, namely one that can be proven by measurement or physical experience and fit into a permanent mental box.  A shift occurs when we come to the realization that these ways of acquiring knowledge are actually created by the perception filter of those doing the inquiry. This applies to science, history, politics, and religion alike. We are masters of storytelling and of creating stories of truth through our filters. So what begins to happen when we become aware of the filters themselves and begin to seek a different way of knowing that is not dependent on an outside source? This is the path of gnosis and intuitive guidance.