A person without understanding is like someone with no tongue who is unable to distinguish the hitter from the sweet. Similarly, when the various `tastes’ of sensations, feelings, perceptions and cognitions become muddled, we lose our ability to discriminate true knowledge from opinions and mere speculation.
Often we just accept anything that comes in the door and calls itself knowledge. But if this text is to be useful, it should be examined carefully and critically.
Tarthang Tulku Rinpoche
Mind in Buddhist Psychology