When trying to understand what Zen is all about, and putting aside popular notions of stylistic minimalism, we must consider the fable of the frog and the scorpion in detail. To recap, the rains force the scorpion to ask a frog for a ride across the swollen stream. The frog says that this will only work if the insect keeps his stinger up. The scorpion agrees and they enter the stream. Half way across the current is swift and the scorpion stings the frog. When both start to drown, the frog asks for an explanation. Famously, the scorpion says because it is my nature.
The Western interpretation stands on the idea that a leopard cannot change its spots, and a scorpion is a creature of instinct, which the frog should never have doubted.
From an Eastern perspective, particularly Buddhist, the frog took compassion on a living creature and could not deny the scorpion a ride no matter how big the risk. That the frog was stung resulted from its karma.
The Zen perspective is less lofty. The frog had good reason to think the scorpion would not commit suicide. They were headed in the same direction. Putting aside its fear of death,
the frog enters the stream like going into battle. Once stung, it knows its time has come. Out of curiosity it wonders why the scorpion was so stupid, but is not surprised.
The rule of inner nature always applies, but if the frog is a Zen student the fact that it was going to meet its mate with great eagerness is just a story of desire. There is no reason to blame anticipation for clouding the mind. It didn’t; what the frog realized was that the rain, the scorpion, the stream, were its circumstance. Original Nature is the path beyond self. No use complaining, minutes later, the scorpion would drown alone.