What is meant by human nature?

The following is an excerpt from a samvaad (dialogue) session with Acharya Prashant.

Acharya Prashant (AP): Two monks were washing their bowls in the river when they noticed a scorpion that was drowning. One monk immediately scooped it up and set it upon the bank. In the process, he was stung. He went back to washing his bowl and again the scorpion fell in. The monk saved the scorpion and was again stung. The other monk asked him, “Friend, why do you continue to save the scorpion when you know its nature is to sting?” “Because”, the monk replied, “to save it is my nature.”

The story uses the word ‘Nature’ two times and the two usages, the two expressions, the two incidences where the word “nature” comes, tell us something about the word.

The first time when the monk says that to sting is the scorpion’s nature, he is using the word “nature”, as representative of its physical conditioning, as representative of its biology. You cannot have a scorpion that does not sting. To be a scorpion is to sting. The second time the word “nature” comes, it does not refer to the acquired genetic tendency. The monk says, “to save it is my nature.” You surely can be a monk who does not save a scorpion but you can never be a scorpion that does not sting. Understand the difference.