Do not be attached to states
While meditating, the combination of the four elements of earth, water, fire, and wind, of which we are all composed, can all enter samadhi. They can enter the samadhi of emptiness or the samadhi of neither thought nor non-thought. While we are in samadhi, we should not become attached to states and should not allow ignorance and afflictions to move us. If we do, our chances of becoming enlightened will be obstructed.
Let me tell you another koan to illustrate this. In the past, there was an old cultivator who wanted to be born in the Heaven of Neither Thought nor Non-thought, the highest heaven in the formless realm. And so he cultivated the samadhi of neither thought nor non-thought. He was cultivating on a seashore, and was just about to enter the samadhi of neither thought nor non-thought, when the noise of a fish playing in the water disturbed him so that he could not enter samadhi. When he opened his eyes, the fish immediately swam away. He then continued meditating, and just when he was about to enter samadhi, the fish swam back again. This happened many times and caused the old cultivator to feel terribly frustrated. Anger welled and he thought, “I wish I could turn into a king fisher and eat up all the fish in the water!”
His hatred scared the fish away and it dared not come again. The old cultivator finally managed to enter the samadhi of neither thought nor non-thought, and was reborn in the Heaven of Neither Thought nor Nonthought, where he enjoyed eighty thousand great eons of heavenly bliss. But because of that fit of anger he had in which he said he wished he could become a bird that ate fish, when his heavenly blessings came to an end, he immediately became a king fisher. It was only when Shakyamuni Buddha had attained Buddhahood, and later expounded the Dharma to him, that he was able to discard the body of a king fisher and be reborn as a human being. He then cultivated under the Buddha and attained Arhatship.
This koan shows why cultivators should not casually get angry, as false thoughts will surely receive retribution. In the Shurangama Sutra, a Bodhisattva named Moonlight specialized in cultivating water samadhi. He contemplated water, and when he entered the samadhi of water-radiance, his body would turn into water. Once, when Moonlight Bodhisattva was in the water-radiance samadhi, his young disciple came to look for him. Upon entering his room, the disciple saw only a puddle of water on the floor. The mischievous disciple then picked up a small stone and threw it into the water.
When Moonlight Bodhisattva came out of samadhi, he felt pain in his stomach and, upon investigation, discovered that there was a small stone inside it. He called his disciple and, questioning him, found out that the child had come into his room while he was in samadhi and had thrown a stone into the puddle he saw there. The teacher then instructed his disciple to wait until he entered samadhi again and then come into the room to retrieve the stone. This koan shows us that as long as a cultivator practices with focused concentration and vigor, he will surely succeed. Cultivation requires one to be focused in order to be effective. If our mind remains firm and determined, we will definitely receive a response from the Dharma.