Once there was an old cultivator who hoped to ascend to the Heaven of the Station of Neither Thought nor Non-thought and so he cultivated the Samadhi of the Station of Neither Thought nor Non-thought.
He cultivated that samadhi beside the sea. When he was on the verge of entering the Samadhi of the Station of Neither Thought nor Non-thought, a fish was playing nearby and the sound of the water he splattered up kept the old cultivator from entering samadhi.
But when he opened his eyes, the fish instantly swam away. He continued meditating and was again just about to enter samadhi when the fish swam back. This happened several times until finally the old cultivator got upset. Hatred arose in his mind and he thought: If I could turn into a kingfisher, I could eat that fish!”
His anger scared the fish away for good. Eventually the old cultivator was able to enter the Samadhi of the Station of Neither Thought nor Non-thought. In time, he was reborn in the Heaven of the Station of Neither Thought nor Non-thought where he enjoyed eighty thousand great eons of heavenly blessings.
But when his heavenly blessings finally ended, he was reborn in the animal realm as a kingfisher that ate fish all day.It wasn’t until after Shakyamuni Buddha became a Buddha and spoke Dharma for him that he was finally released from the kingfisher retribution. At that point he gained a human body, followed the Buddha in cultivating the Way, and attained the fruition of Arhatship.
From this we can see that cultivators cannot casually give rise to hatred in their minds. We certainly will have to undergo retribution for our false thoughts.