Actually the mind, like rain water, is pure in its natural state. If we were to drop green dye into clear rainwater, however, it would turn green. If yellow dye were added, it would turn yellow.

The mind reacts similarly. When a comfortable mental impression drops into the mind, the mind is comfortable. When the mental impression is uncomfortable, the mind is uncomfortable. The mind becomes cloudy, like the colored water.

When clear water contacts yellow, it turns yellow. When it contacts green, it turns green. It will change color every time. Actually the water that turned green or yellow is naturally clean and clear. This is also the natural state of the mind - clean and pure and unconfused. It becomes confused only because it pursues mental impressions. It gets lost in its moods.(From A Tree In a Forest)