_Hills are hills. Water is water. Monks are monks. Laymen are laymen. But these mountains, these rivers, the whole world itself, together with the sun, moon, and stars--not one of them exists outside your minds! . . . Phenomena do not arise independently, but rely upon (the mental) environment (we create).17 _ Since reality is created by the mind, we will never know what is "real" and what is illusion. Examples of this are commonplace. The electron is both a wave and a particle, depending upon our point of view. Which is "reality"? Furthermore, concepts limit. By treating the world using rational constructs, we force it into a limited cage. But when we deal with it directly, it is much more complex and authentic. To continue the example, the electron may be something much more complex than either a wave or a particle, since it behaves at times like either or both. It may in fact be something for which our rationality-bound mind has no "concept." The illusory world we think we see around us, deceptively brought to us by our untrustworthy senses, leads us to conceptual thought and to logical categories as a means to attempt its "understanding." The resulting intellectual turmoil is just the opposite of the tranquility that is Ch'an. But avoidance of conceptual thought leads to a serene, direct, and meaningful understanding of the world around us, without unsettling mental involvement. _Ordinary people all indulge in conceptual thought based on environmental phenomena, hence they feel desire and hatred. To eliminate environmental phenomena, just put an end to your conceptual thinking. When this ceases, environmental phenomena are void; and when these are void, thought ceases. But if you try to eliminate environment without first putting a stop to conceptual thought, you will not succeed, but merely increase its power to disturb you.18 _ What is worse, reliance on misleading perception blocks out our experience of our own pure mind. _People in the world cannot identify their own mind. They believe that what they see, or hear, or feel, or know, is mind. They are blocked by the visual, the auditory, the tactile, and the mental, so they cannot see the brilliant spirit of their original mind.19 _When he was asked why Zen students should not form concepts as other people do, he replied, "Concepts are related to the senses, and when feeling takes place, wisdom is shut out."20 Huang-po is so adamant against the deceiving world of the senses he even comes down hard on the pleasures of the gourmet. _Thus, there is sensual eating and wise eating. When the body suffers the pangs of hunger and accordingly you provide it with food, but without greed, that is called wise eating. On the other hand, if you gluttonously delight in purity and flavour, you are permitting the distinctions which arise from wrong thinking. Merely seeking to gratify the organ of taste without realizing when you have taken enough is called sensual eating.21 _