Genjo Koan

Enlightenment is like the moon reflected in the water. The moon does not get wet, nor is the water broken. Although its light is wide and great, the moon is reflected even in a puddle an inch wide. The whole moon and the entire sky are reflected in dewdrops on the  grass, or even in one drop of water. Enlightenment does not divide you, just as the moon does not break the water. You cannot hinder enlightenment, just as a drop of water does not hinder the moon in the sky. The depth of the drop is the height of the moon. Each reflection, however long or short its duration, manifests the vastness of the dewdrop, and realizes the limitlessness of the moonlight in the sky.

When you sail out in a boat to the midst of an ocean where no land is in sight, and view the four directions, the ocean looks circular, and does not look any other way. But the ocean is neither round nor square; its features are infinite in variety. It is like a palace. It is like a jewel. It only looks circular as far as you can see at that time. All things are like this. Though there are many features in the dusty world and the world beyond conditions, you see and understand only what your eye of practice can reach. In order to learn the nature of the myriad things, you must know that although they may look round or square, the other features of oceans and mountains are infinite in variety; whole worlds are there. It is so not only around you, but also directly beneath your feet, or in a drop of water.

A fish swims in the ocean, and no matter how far it swims there is no end to the water. A bird flies in the sky, and no matter how far it flies, there is no end to the air. However, the fish and the bird have never left their elements. When their activity is large their field is large. When their need is small their field is small. Thus, each of them totally covers its full range, and each of them totally experiences its· realm. If the bird leaves the air it will die at once. If the fish leaves the water it will die at once. Know that water is life and air is life. The bird is life and the fish is life. Life must be the bird and life must be the fish. It is possible to illustrate this with more analogies.

Practice, enlightenment, and people are like this.

Now if a bird or a fish tries to reach the end of its element before moving in it, this bird or this fish will not find its way or its place. When you find your place where you are, practice occurs, actualizing the fundamental point. When you find your way at this moment, practice occurs, actualizing the fundamental point; for the place, the way, is neither large nor small, neither yours nor others'. The place, the way, has not carried over from the past, and it is not merely arising now. Accordingly, in the practice-enlightenment of the buddha way, meeting one thing is mastering it; doing one practice is practicing completely.

Here is the place; here the way unfolds. The boundary of realization is not distinct, for the realization comes forth simultaneously with the mastery of dharma. Do not suppose that what you realize becomes your knowledge and is grasped by your consciousness. Although actualized immediately, the inconceivable may not be distinctly apparent. Its appearance is beyond your knowledge.

Zen master Baoche of Mount Mayu was fanning himself. A monk approached and said, "Master, the nature of wind is permanent and there is no place it does not reach. Why, then do you fan yourself?" "Although you understand that the nature of wind is permanent;" Baoche replied, "you do not understand the meaning of its reaching everywhere." "What is the meaning of its reaching everywhere?" asked the monk again. The master just kept fanning himself. The monk bowed deeply. The actualization of the dharma, the vital path of its correct transmission, is like this. 

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Excerpted from here.